Born in Fort Worth, Texas, to Horace Seaver Carswell, Sr. and Bertha Carswell, Carswell attended North Side High School, where he played football, with his highlight being the winning touchdown he scored on Armistice Day in a game against Wichita Falls in 1933. After graduation from North Side, Horace attended college at Texas A&M University for a year as a member of the class of 1938, and then began attending Texas Christian University where he graduated in August 1939 with a bachelor's degree in physical education. Among his teammates on the Horned Frog football team were quarterbacks Sammy Baugh and Davey O'Brien. On a double date while still at TCU, Horace met a co-ed featured in one of the yearbook's beauty pages, by the name of Virginia Adaline Ede. Virginia was from a ranching family from the west Texas town of San Angelo. They were married in October 1941.
Military service
After the German invasion of Poland, Carswell decided to join the U.S. Army Air Forces. He was appointed a flying cadet in Dallas on March 26, 1940, and trained at Tulsa, Oklahoma, and Randolph and Kelly Fields, Texas, getting his commission and wings toward the end of 1940. He instructed at Randolph and Goodfellow Fields in Texas, with promotion in February 1942, to first lieutenant.
Carswell was flying a B-24 Liberatoron the night of October 26, 1944, on a single-aircraft mission against a Japanese convoy in the South China Sea. He elected to make a second low-level run over a thoroughly alerted convoy and scored two direct hits on a large tanker. His co-pilot was wounded, and his aircraft had two engines knocked out, a third damaged, the hydraulic system damaged, and a fuel tank punctured. He managed to gain enough altitude to reach land, where he ordered the crew to bail out. Eight did, but the bombardier's parachute was too badly damaged to use. Instead of bailing out, Carswell stayed with the bombardier and the wounded co-pilot, and attempted a crash landing. The badly damaged aircraft crashed against a mountain, and all three aboard were killed. Carswell was buried at a Catholic mission in Tungchen, China. He was survived by his wife and son. Carswell Memorial Park - where his remains now rest - in Oakwood Cemetery, is named in his honor.
He piloted a B-24 bomber in a one-plane strike against a Japanese convoy in the South China Sea on the night of 26 October 1944. Taking the enemy force of 12 ships escorted by at least 2 destroyers by surprise, he made 1 bombing run at 600 feet, scoring a near miss on 1 warship and escaping without drawing fire. He circled. and fully realizing that the convoy was thoroughly alerted and would meet his next attack with a barrage of antiaircraft fire, began a second low-level run which culminated in 2 direct hits on a large tanker. A hail of steel from Japanese guns, riddled the bomber, knocking out 2 engines, damaging a third, crippling the hydraulic system, puncturing 1 gasoline tank, ripping uncounted holes in the aircraft, and wounding the copilot; but by magnificent display of flying skill, Major Carswell controlled the plane's plunge toward the sea and carefully forced it into a halting climb in the direction of the China shore. On reaching land, where it would have been possible to abandon the staggering bomber, one of the crew discovered that his parachute had been ripped by flak and rendered useless; the pilot, hoping to cross mountainous terrain and reach a base, continued onward until the third engine failed. He ordered the crew to bail out while he struggled to maintain altitude and, refusing to save himself, chose to remain with his comrade and attempt a crash landing. He died when the airplane struck a mountainside and burned. With consummate gallantry and intrepidity, Major Carswell gave his life in a supreme effort to save all members of his crew. His sacrifice, far beyond that required of him, was in keeping with the traditional bravery of America's war heroes.