Help with monsters invading me

[Catlee]

I sent a merchant out to buy some goods at the market - but now the mission icon is red and when I click on it - it says Robbery on the way. It looks like a bunch of orcs or monsters of some sort under the description. Do I have to tell my troops to do anything, and if so how do I? or do they just defend and attack the monsters when they get to my city automatically?

[MithryL]

it will be automatic , only thing u can do is :

hide your troop for not them to be killed (that if u think u can't handle the incoming wave)
close door but you will need BG to do so and not worth it (not for a monster attack at least)

maybe i missed something .

[Catlee]

I wanted to let you know your advice was right.
it was not very many monsters that ended up attacking my city and I didn't have to do anything - my fortification tower killed them
Thank you for your help