Filibuster: a soldier of fortune who engages in military adventurism in a foreign country or territory to foment or support a revolution (flourished 1840s/1850s) [‘Filibuster (military)’, Wikipedia, http://en.m.wikipedia.org]. Also known as ‘freebooters’, they were privately organised, irregular soldiers or militia used to try to effect regime change or exploit a power vacuum. 

 

The 1850s coincided with a surge of filibuster activity launched from within the United States and targeted at Mexico. The majority of the filibuster expedition participants were Americans of Anglo-Saxon or Anglo-Celtic descent but there were other nationalities involved including French expeditions (eg, de Pindray, Raousset)✱.

What accounts for the massive spurt in filibuster ventures at this time? Conditions on both sides of the US and Mexican borders were conducive to their prevalence. A contributing factor was the inability or unwillingness of both sets of authorities to curb the filibusters. 

∆ “Republic of Sonoro” flag

An accessible and porous Mexican frontier
The area of the western border region—separating the new American state of California and the Territory of New Mexico (including Arizona) from the Mexican states of Baja California and Sonoro—was largely frontier land, lacking effective natural boundaries and sparsely populated at the time. The northern Sonoro part of the frontier in particular was a bit of a “no man’s land” and thus considered a “lawless zone”. The Mexican government lacked the resources and men to patrol the northern border properly. Indian raids from US territory into the Mexican frontier were common [Scott Martelle, in ‘Hundreds of 19th Century Americans Tried to Conquer Foreign Lands. This Man Was the Most Successful’, (Sarah Pruitt), History, 07-Mar-2019, www.history.com]. The government in Mexican City was doing little to redress the northern vulnerability, a plan to colonise (thus strengthening) Sonoro’s northern frontier, the Paredes Proyectos in 1850, was rejected by the Mexican National Congress. To the American filibusters, all of this made the prospect of invading Mexican territory more appealing.

∆ Filibuster militia in training (Source: Britannica).

US turns a blind eye to filibusters
Official complacency and a reluctant to commit effectively also prevailed on the US side. Hamstrung by a small army, the troop commitment by Washington to the border, which stretched 3,200 km from the Pacific to the Gulf of Mexico, was in perpetual shortfall. With insufficient numbers to police the borders and ports, the government’s response to private filibuster ventures was confined to threats [‘The US Army on the Mexican Border: A Historical Perspective’, ((Matt M. Matthews), (The Long War Series Occasional Paper 22), www.apps.dtic.mil/]. Various neutrality acts forbid Americans from engaging in warfare with foreign countries, however its enforcement by Congress was sporadic and selective. At best, the US approached the task of curbing the wave of filibusters in a half-hearted fashion, ‘Feature the Filibuster Movement’, PBS, www.pbs.org/].

President Fillmore (Whig Party) was not not inclined towards expansionism himself, but he did little to curb the filibuster raids on Mexican soil. His successor Franklin Pierce (Democrat) was more open in his expansionist policies including attempting, unsuccessfully, to purchase Cuba from Spain (which many, especially Southern Americans thought would open the way to it becoming a pro-slavery state) [Joseph Allen Stout, Schemers and Dreamers: Filibustering in Mexico, 1848-1921, (2002)].

Southern comfort to the Filibusters
The filibuster movement elicited strong support from the South – in troops and in financial backing. Wealthy Southern landowners and agriculturalists helped finance expeditions into Mexico. José Carbajal, a Tejano, recruited Anglo-Texans including Texas Rangers for his 1851 armed incursion across the Rio Grande into Tamaulipas. Carabajal’s inducement to gain Texan participation was the opportunity to capture runaway slaves from Texas✪ [José María Jesús Carbajal‘, Wikipedia, http://en.m.wikipedia.org].

Texas, expanding slavery and the filibusters
As with US’ designs on Cuba, Texan land barons saw the prize of land south of the border as a means of securing independent, slave-owning states, thus tipping the balance in favour of pro-slavery states in the US. Chunks of Mexico and other Latin American countries such as Nicaragua were desirable to Texans as viable trading stations for the African slave trade, and as a cheaper source of labour than Texas [‘Texans and Filibusters in the 1850’s’, (Earl W. Fornell), Southwestern Historical Society, LIX(4), April 1956]. The model for an American colony in northern Mexico took inspiration from Sam Houston’s ‘liberation’ of Texas from Mexico [‘How Tennessee Adventurer William Walker became Dictator of Nicaragua in 1857′, (John E. Norvell), Middle Tennessee Journal of Genealogy and History, Vol. XXV, No 4, (Spring 2012), www.thenashvillecitycemetery.org].

∇ The Walker story gets the Hollywood treatment (1987)

William Walker and the “Independent Republic of Sonoro”
The best known of the American filibusters in the 1850s was William Walker. Tennessean Walker’s idea was to colonise Mexican territory in Baja California and Sonoro, where he sensed there was a power vacuum. With an armed force comprised mainly of Tennesseans and Kentuckians, Walker tried to establish first one then another self-declared (but unrecognised) republic. Walker’s attempted takeover was short-lived, meeting unexpected stiff resistance from the Mexican army and local citizens (Norvell).The Tennessean chancer’s venture ultimately floundered on poor planning (logistics problems, shortages of supplies, unfamiliarity with the territory). Forced to return to California Walker was put on trial for violating the US/Mexican Neutrality Act, but with American sympathy running high for Walker and for filibusterers in general he was swiftly acquitted in a travesty of a trial (Pruitt)🀾.

Nicaraguan adventure
This was a green light for Walker to roll the dice again in the hemisphere filibuster game, turning his attention to Nicaragua in 1855…this time however it wasn’t to end as happily. With a small army of mercenaries he invaded the Central American country and did succeed in usurping power and installing himself as “Dictator of Nicaragua”, and even securing recognition from President Pierce for his regime. However from that point on it went badly “pear-shaped” for Walker. By 1857 Walker had alienated locals as well as American shipping magnate Cornelius Vanderbilt. A combined force from Costa Rica, Honduras and Nicaragua, bankrolled by Vanderbilt, routed Walker’s army and banished him. Imprudently, Walker made two more coup attempts in Central America before his notoriety caught up with him. The British, concerned that Walker’s fomenting of rebellion might destabilise its colonies in the Greater Caribbean, handed him over to the Honduran government who promptly executed him in 1860 [‘William Walker: King of the 19th Century Filibusters’, (Ron Soodalter), HistoryNet, www.historynet.com/].

(Source: www.wsj.com)

Endnote: Filibusters and Manifest Destiny
William Walker’s personality has been described as “a mix of hubris, ambition and nascent white supremacy” (Martelle, cited in Pruitt). The military men who followed him and other filibuster leaders were motivated by several considerations – a love of adventure, greed for personal gain and ideology. They like many contemporary Americans believed in the doctrine of “Manifest Destiny”, in the 19th century ingrained in American culture. This embodied the belief that it was an inalienable right of Americans to extend their civilisation across the continent (‘Feature the Filibuster Movement’)⎈.

PostScript: Historian Brian E May has made the interesting observation that the plague of filibustering expeditions had an counter-effect hampering the United States’ best efforts to empire-build in the hemisphere. The activities of filibusters, though they had widespread support within the US, he notes, damaged US foreign policy and limited its territorial expansion, almost in defiance of the locomotive of Manifest Destiny. The rebound from the filibusters’ intervention engendered hostility from foreign countries such as Canada and Great Britain, and Hispanic-Americans, who pushed back against US expansionism [A. James Fuller. ‘Reviewed Work. Manifest Destiny’s Underworld: Filibustering in Antebellum America, by Robert E. May, Journal of the Early Republic, Vol. 22, No 4 (Winter 2002), pp.722-724. www.jstor.org/stable/3124776]🃗.

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✱ many of these has been lured to California by the prospect of gold discovery, these hopes disappointed, they turned their eyes south to other potential sources of enrichment, eg, news of gold and silver finds in Baja California

✪ Mexico abolished slavery in 1829, if Texan filibusters could capture territories in northern Mexico, it would make the reintroduction of slavery possible

🀾 Henry A Crabb, a schoolmate of Walker’s, followed him in a filibuster foray into Mexico, also making a failed attempt to colonise part of Sonoro in 1857 – claiming to “liberate the people of Sonoro” and suffering the same fate as Walker, execution at the hands of Mexican troops

⎈ as Nelson put it, “filibusters epitomised the romantic, muscular spirit of American adventure”, a sense of mission inspired by Manifest Destiny (Nelson)

🃗 May also reminds us that the increasing intensity of the criticism of the filibusters by the Federal government hardened Southern resolve to ultimately secede from the Union (Nelson)