Granger was born in Zanesville, Ohio. He graduated from the United States Military Academy, placing 28th in the class of 1838. Granger became a first lieutenant of infantry in 1839. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️
Seminole War, and was assistant instructor of tactics at West Point in 1843<unk>44. During the Mexican-American War, Granger was promoted to captain on September 8, 1847. ąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąą