Rimworld defeating massive infestation

This video should be self explanatory but in case someone has any questions here is short guide:

1. Pick 3 or 4 most capable melee colonists.
2. Look for the one with either tough trait or highest melee dodge chance and dress him up in the best armor and clothing you have. You want sharp damage protection. The guy in the middle will have the most damage coming his way so be ready for that.
3. Use weapons with the best short to mid range accuracy on pawns behind. You don't want to use high burst and low accuracy weapons like miniguns because they may destroy walls in front of you and that wouldn't be good.
4. If you are not scared of addictions you can let your main warrior drink go-juice before the fight as it helps with a lot of things.
5. Very important! Remember to close, forbid or seal all other ways to infestation. If there are any vents between you and infestation, put wall in front of them because they will be destroyed and you will be surrounded by bugs.

The best melee weapons to use are either plasteel swords or uranium maces. You may also be tempted by frag grenades but don't use them, one miss and grenade will land between your pawns, damaging everyone.

Good luck