How do you defend with these units?

[smooth_operator]

So I was playing the Peninsular campaign as the British and I found my settlement at Coimbra beseiged by an army of Marechal Massena. Here are the details

My Army:
5 Armed Citizenry
1 Foot
2 Light Foot

Massena's Army:
5 Fusiliers of the Line
2 Dragoons
1 Chausseurs a Cheval
1 6-lber Cannon
1 General's Bodyguard(Massena)


By some kind of miracle(or I was just too cunning), I was able to rout the entire army and even kill Massena. How would you have done it?

[Fisherking]

I had one a bit like that.

I had two militia and a light foot. I may have had more armed citizenry though.

I was lucky enough to get an area next to the town with a walled off area. I had entrenchments too.

The light food did most of the work running back and forth in the area to take care of the next threat.

I had one armed citizenry rout but they came back and I put them in a building helping out the militia that doubled as my general.

Once they exhausted them selves in the attack I just moved out to take on the cannon. It just routed away.