Meaning of "climactic battle"

[Cooliegirly]

"...the hero strings his bow for the climactic battle..."

What does "string one's bow" mean? And what is a "climactic battle"?

[Mister Micawber]

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To string one's bow is to place the bowstring on the bow, to prepare that weapon for battle. A bow when not in use does not usually have its string mounted-- that would weaken the bow.

A climactic battle is one which is the climax, the deciding battle of the war (or the movie).
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Native English teacher at Mister Micawber's