'Expert in War' in the Bible

The Reubenites, the Gadites, and the half-tribe of Manasseh [had] {valiant} men [who] carried a shield and a sword, and archers, and [who were] expert in war, forty-four thousand seven hundred and sixty [for] going out [as] an army.

Of Zebulun, such as went forth to battle, expert in war, with all instruments of war, fifty thousand, which could keep rank: they were not of double heart.

And of the Danites expert in war twenty and eight thousand and six hundred.

And of Asher, such as went forth to battle, expert in war, forty thousand.