en_tn_condensed/2sa/18/02.md

one-third ... another third

"one-third of the army ... another third of the army." A "third" is one part out of three equal parts.

Gittite

This refers to a person from Gath, which is a Philistine city.

I will certainly go out with you myself, too

"I myself will go with you to battle" or "I personally will go with you into battle"