Help the medieval historian complete their account of the battle using the most elegant, grammatically concise phrasing.

King Arthur deployed his cavalry to the northern flank, and _____

The correct answer is Sir Lancelot, his archers to the southern ridge.

This is an advanced form of ellipsis called gapping. In coordinated clauses with parallel structures, we can completely drop a repeated verb ("deployed") to avoid redundancy. A comma is typically used in formal writing to indicate where the missing verb used to be. The other options use incorrect verbs or scramble the word order!