The man, the myth, the legend, the revolutionist.
After the Battle of the Alamo, Sam Houston, short on supplies, did the (at the time) very controversial Runaway Scrape where he retreated from Santa Anna's army. This "cowardly" act and heavy rainfall lowered the Texan Army's morale and made them think of leaving Sam Houston and fighting Santa Anna face-to-face. The Runaway Scrape proved to be extremely strategic though as they were able to ambush Santa Anna forces. This won them the revolution and Texas' Independance.
Sam Houston was elected president twice (in 1836 and 1841). His main goal at first was to be annexed with the U.S. but he dropped this goal quickly thinking it was outlandish. He never got to see Texas combine with the U.S. but he was a main factor in the start of it.
Sam Houston: One of the Most Remarkable Figures in American History (1993)