[4] In 1807, Walker went to Mexico and joined the Spanish army, serving as a lieutenant of dragoons, and later becoming master of a military school at Chihuahua.

He was active in promoting the State Militia, and was credited with improving the organization and discipline of that force.

In 1849 he ran for Governor, winning against split Whig opposition from General Alexander De Clouet and Duncan F. Kenner.

Walker strongly objected to this document, and, as a result, he subsequently resigned his position the following year, retiring to a family plantation in Rapides Parish.

[6] He turned down offers from Democratic Party officials to be their candidate for the United States House of Representatives.