 Complete the following phrase:  In August 1845, Magruder volunteered for assignment in Corpus Christi, Texas, to join General Zachary Taylors army there, occupying the former republic; the US was on the verge of war with Mexico over the question of annexation. After hostilities opened on April 25, 1846, Magruder first saw combat at the Battle of Palo Alto, 14 days later. On April 18, 1847, Magruder served with zeal and ability, in General Winfield Scotts expedition, under heavy fire and turned Mexican artillery against them at 