There. Emphatic. Hebrew. sham. Compare Genesis 2:8; Exodus 40:3 (therein). Deuteronomy 1:39 (thither). 2 Chronicles 6:11 (in it).
brake He. hath He broken in pieces.
battle. Put by Figure of speech Metonymy (of Adjunct), for other weapons used in battle.
Selah. Connecting the Jebusite defeat with God Who gave it; and passing on from the third person to the second. See App-66. Note the emphasis on "Thou".