'Trained' in the Bible

When Abram heard that his relative had been taken captive, he led out his trained men, born in his house, three hundred and eighteen, and went in pursuit as far as Dan.

From the Gadites there came over to David in the stronghold in the wilderness, mighty men of valor, men trained for war, who could handle shield and spear, and whose faces were like the faces of lions, and they were as swift as the gazelles on the mountains.

Their number who were trained in singing to the Lord, with their relatives, all who were skillful, was 288.

Although I trained and strengthened their arms,Yet they devise evil against Me.

Ephraim is a trained heifer that loves to thresh,But I will come over her fair neck with a yoke;I will harness Ephraim,Judah will plow, Jacob will harrow for himself.