The Mexican War between the United States and Mexico began with a Mexican attack on American troops along the southern border of Texas on Apr. 25, 1846. Fighting ended when U.S. Gen. Winfield Scott occupied Mexico City on Sept. 14, 1847; a few months later a peace treaty was signed (Feb. 2, 1848) at Guadalupe Hidalgo. In addition to recognizing the U.S. annexation of Texas defeated Mexico ceded California and, New Mexico (including all the present-day states of the Southwest) to the United States.
Progress
http://search.atomz.com/search/?sp-q=Donaho&sp-a=00062a1b-sp00000000
has a number of people of the name
http://www.tsha.utexas.edu/handbook/online/articles/GG/qeg2.html
John Donaho was of the Kentucky Mustangs who apparently were massacred at Goliad
by the Mexican General Santa Ana
Next Stages
Find someone to take it on as original person has withdrawn