When the witch of En-dor brought up who appeared to be the Prophet Samuel to him and was told by Samuel of his and his sons' death in 1Samuel 28:19.
Yes King Saul died in battle. The enemy was the Philistines and one of them shot Saul with an arrow badly wounding him. Then Saul said to his armorbearer to thrust him through with his sword, but the armorbearer refused being afraid. So Saul took a sword and fell on it thus dying (I Samuel 31:1-6).
He united Israel and didn't die in battle.
Saul Ascher died in 1822.
Saul Hertz died in 1950.
Saul Abramzon died in 1977.
Saul Solomon died in 1892.
Saul Isaac died in 1903.
Saul Yanovsky died in 1939.
Saul Rosenzweig died in 2004.
Saul Amarel died in 2002.
Saul Rae died in 1999.
Patrick Saul died in 1999.