[your groups should assemble at this page]

The orcs are wider then your skinny humans. There is one orc opposing 1 human. As they advance, each front row soldier has 1 chance to throw a javelin.
Each soldier throwing a javelin or pilum makes a L1-SR on dex. Calculate any damage to the orcs, taking into account their armor.

[This is also the moment to use your javelin throwing organ, minicatapult, or greek fire bomb, if you have any]

If all 5 front orcs take more than half their con as damage, and if your front row soldiers took any training in javelin throwing, all the orcs fly away in panic. The battle is over.

Else close in.