Medic rush

From TF2 Wiki

The Medic rush is a tactic where you have an entire team of Medics paired with other Medics. If you can make sure half the medics have Blutsauger's and half Mediguns, this will make it harder to kill individual Medics. If all the armed Medics fire at once it can create a volley of syringes that will be difficult to dodge, along with a succession of ÜberCharge's which can make for an almost unstoppable assualt. ÜberCharges neccesitate a high level or coordination and teamwork however, and once they fade out you will be left vulnerable. This can be effective for capping individual points however.