Just take some rams ....better capped,they are more resistant and garrison into them some elite huskarls...the battering ram and capped can garrison 4 units and the siege ram 6 units ,here s your answer
in general, if you encounter a problem that you cant counter, do not fight it.
You don not have to beat the army to win, go around it, get his economy, play mind games.
But do not start a battle you do not know how to win.
Use quicker units, raid vills, (carts if there are), sneak vills behind his base, buy time vs his army, use decoy, make backups, etc. Divide and conquer.
There is a lot more tricks to play then the straightforward slaughter.
samurai has good bonus
Don't stop building your eco.
You don not have to beat the army to win, go around it, get his economy, play mind games.
But do not start a battle you do not know how to win.
Use quicker units, raid vills, (carts if there are), sneak vills behind his base, buy time vs his army, use decoy, make backups, etc. Divide and conquer.
There is a lot more tricks to play then the straightforward slaughter.