Grimes was promoted to lieutenant colonel on May 1 , 1862 .
Grimes was fought at the Battle of Seven Pines , during which he was wounded when his injured horse fell on top of him on May 31 .
Grimes was promoted to lieutenant colonel on May 1 , 1862 , and fought at the Battle of Seven Pines , during which he was wounded when his injured horse fell on top of him on May 31 .