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In Aranya Kaand, Raam asked Lakshman to take Seetaa to a mountain cave and guard Her, when Khar  and his army came to attack Him. This sending away of Seetaa and Lakshman far from the fighting place has got four reasons in the complex of She-He-Me. 

(1) One is that this Seetaa had to be sent away from that prospective battlefield, because Seetaa was not trained for warfare as Raam's third mother Kaikeyee was.

(2) Secondly, we see no killings or slayings in Raamaayan in the presence of Seetaa, because She, as Lakshmee, condones any sinner and accords salvation to him or her. As such there might be a probability of Her hindering the war to accord salvation to Khar and Dooshan, which Raam never wanted.

(3) Thirdly,  Lakshman was an intolerant of any assault on his brother or sister-in-law and may colloid head-on with the aggressors and that might lead Raam up to Lankaa to confront even Raavan. That is the snaky aggressive nature of Lakshman. At that moment Raam didn't want to do this so He sent Him also away before any further dialog occurs between them. 

(4) Fourthly, Raam was the first one to promise the sages and saints to eradicate Raakshas, for which Seetaa nagged Him not to wage a causeless war. Therefore, if Raam went to hide in any cave camouflaged by trees along with Seetaa, and sent Lakshman for fighting, the very character of Raam is at stake. Thus as promised to sages and saints Raam alone wanted to trigger off the elimination process of Raakshas.