'Expert' in the Bible
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.
They all hold swords, being expert in war: every man hath his sword upon his thigh because of fear in the night.
For, lo, I will raise and cause to come up against Babylon an assembly of great nations from the north country: and they shall set themselves in array against her; from thence she shall be taken: their arrows shall be as of a mighty expert man; none shall return in vain.