tl;dr summary: sound tactics can sometimes make up for starting with two discos, with some tactical suggestions by weight.
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As anyone who has played the game for more than a few drops knows, it is not rare for a match to start with one or two disconnects just as the match starts. While once in a while these disconnects will simply result in an 11v11 match-up, more frequently one side is going to be down by one or two mechs at the start.
This does not mean, however, that the match is automatically lost. By sticking together, the team that is down can create local situations where they outnumber the larger team. Having a greater number of mechs in a small area is better than having a greater number of mechs that are spread out all over.
By weight class what you should do :
Lights -- scout a bit and then return to the group; repeat. Don't engage, and if engaged try to get the enemy to pursue you back to the rest of your team. In assault, capping may be worthwhile to try to split the enemy team, but also may just get you killed early and make things worse. DO NOT DIE. The dead are of no use to anyone. When the main body engages, look for targets on the flanks and rear while they are distracted.
Mediums -- stay with a heavy, provide fire support on their target and intercept any lights that try to hit the heavies' flanks and rear. While sometimes Cicada's are lumped in with lights, in a situation where the team is down I would suggest acting more like a medium, at least until the numbers even up.
Heavies -- stay with the assaults. Don't over-pursue flankers, if there is a choice between shooting a medium, light, or heavy, shoot the heavy. I would suggest shooting enemy heavies before shooting enemy assaults, but that's very situational and not a hard and fast rule. Just be aware that choosing between heavy and assault targets is not a hard rule, but choosing between those and mediums and lights pretty much is. Do not get tunnel vision.
Assaults -- you are the nucleus of the formation, and the point of the spear in any attack. If there are two or more assaults, then form up in no more than two groups, and even if there are two groups they should remain in contact with each other for mutual support. If you are alone then you are doing it wrong.
Lastly, in a situation where local superiority is established, then attack. Don't under-commit, don't over-think, just go in there and shoot stuff until it goes boom. During the attack don't leave your assaults behind. If you need to look more than 90 degrees to either side to see an assault then you need to slow up to let them give (and take) fire*.
While most of this is good advice in any situation (or seems that way to me), it is more important when starting down. By staying close, local numerical superiority can be established early, which can swing the odds back in your favor.
edit to break up text and rename as suggested below
*"Slow up" doesn't mean "stop," unless it's behind cover. However, you can also slow your advance by zigzagging relative to the path of the advance, which should allow your assaults to keep up.
Edited by Ertur, 30 January 2014 - 05:29 PM.