Its also good to know 3 bombs will kill swords, and also kill miners, so try get a group of 3 bombers. If his swords are bunched up, blast em. If his swords are spread out either
1. run past them and take out his miners, or
2. kill a single sword with crawlers, holding bombs back out of range.
If you do the later, and he brings in all his swords, then you bring in bombers and blast em.
To do this, you need to focus your control on the bombers most of the time - if your focused on the crawlers he may charge on sword at the bombs and they will auto attack - meaning all your bombs will blow up on just a single sword. If your controlling the bombs, and he tries the acharge with one sword, then you simply withdraw the bombers while your crawlers continue to auto attack the sword (who's not even fighting back any more).
You may need to pull a crawler back now and then if its getting hit by the sword - I suggest two options to consider;
while controlling the bombs, hit 'g' key so they retreat towards garrison, then control the crawler you need to save (this keeps the bombers away from his sword charge trick) select the crawler to rescue and pull him back, when the crawler is safe, use the ctrl-key (ctrl+6 i think) to select bombers and bring them back to position.
OR simply press space to select everything and click the position to retreat to - however this will stop fighting the sword.
On short maps, saddly chaos has to expect to lose against sword rush.
But, what you should try do is focus on keeping what ever he is attacking alive. Use one or two miners to fight early on along side crawlers, and keep spaming crawlers until you can build up enough surviving crawlers to make a counter attack. I think I have a replay of exactly that.
www.stickempires.com/play?replay=replay908109&version=1.59
(this is not the shortest 2 maps, where its very very hard to do, as his swords dont take as long to cross the map)