flour on the beach at the mouth of the bay, thus giving Flour Bluff its name. The United States, ever watchful of its relations with Mexico, sent the schooner Woodbury to help the French in their blockade. Talks between the French Kingdom and the Texan nation occurred and France agreed not to offend the soil or waters of the Republic of Texas. With the diplomatic intervention of the United Kingdom, eventually President Bustamante promised to pay the 600,000 pesos and the French forces withdrew on 9 March 1839. U.S. invasion U.S. territorial expansion under Manifest Destiny in the 19th century had reached the banks of the Rio Grande, which prompted Mexican president José Joaquín de Herrera to form an army of 6,000 men to defend the Mexican northern frontier from the expansion of the neighboring country. In 1845, Texas, a former Mexican territory that had broken away from Mexico by rebellion, was annexed into the United States. In response to this, the minister of Mexico in the U.S., Juan N. Almonte called for his Letters of Recognition and returned to Mexico; hostilities promptly ensued. On 25 April 1846, a Mexican force under colonel Anastasio Torrejon surprised and defeated a U.S. squadron at the Rancho de Carricitos in Matamoros in an event that would latter be known as the Thornton Skirmish; this was the pretext that U.S. president James K. Polk used to persuade the U.S. congress into declaring a state of war against Mexico on 13 May 1846. U.S. Army captain John C. Frémont, with about sixty well-armed men, had entered the California territory in December 1845 before the war had been official and was marching slowly to Oregon when he received word that war between Mexico and the U.S. was imminent; thus began a chapter of the war known as the Bear Flag Revolt. On 20 September 1846, the U.S. launched an attack on Monterrey, which fell after 5 days. After this U.S. victory, hostilities were suspended for 7 weeks, allowing Mexican troops to leave the city with their flags displayed in full honors as U.S. soldiers regrouped and regained their losses. In August 1846, Commodore David Conner and his squadron of ships were in Veracruzian waters; he tried, unsuccessfully, to seize the Fort of Alvarado, which was defended by the Mexican Navy. The Americans were forced to relocate to Antón Lizardo. In confronting resistance and fortifications at the