Don't let the Celt player research Furor Celtica, except if you get Siege Onager (Even then, it isn't a very good idea, unless you are going for Drill/Elite Mangudai/El Dorado/Bombard Towers+ +Bracer and maybe a few others but at least it won't hurt you as much as it normally would). Onagers are excellent against siege, but Bombard Cannons and Trebuchets work well too. In summary: Siege works best against line formation, so avoid that. (Siege Onagers should still kill Heavy Scorpions in one shot, though, but if you have Siege Onager, you have good siege to counter his, to begin with.) If he can get to the Imperial Age and research Furor Celtica, you will need to use 2 Onager strikes instead of one. This does kill the Woad Raiders but if he has enough (30?), you won't, so I don't really recommend it.

Lastly (that I can think of) to do (against Woad Raiders) is to use Hand Cannoneers or massed archers to guard said Onagers. It might kill some of your Onagers, but it is better than all of them. When he sends his Woad Raiders in, attack the ground in such a way that he can't attack without being crushed by the attack. Similarly, you could use the Box Formation with large numbers of Champions as well as some Onagers to protect against Woad Raiders.Īnother thing is to mass Onagers in staggered formation. Trebuchets & Bombard Cannons can also use this, but of course, this does leave them open to enemy Onager/Scorpion/Trebuchet fire. You can also Palisade Wall off the Onagers, which gives you time to kill off his Woad Raiders. One way to counter the other units is encourage your opponent to invest in only one counter (probably Paladins/Cavaliers due to cheaper cost than Onagers and the weakness of Halberdiers against any non-Cavalry bonus) and then once they've massed that counter enough, hammer them with you other options. Onagers are excellent counters because of their high attack, AoE damage and attack bonus versus siege. (Not much of a liability, anyway, against siege) Similarly, box formation can protect vulnerable (siege) units from cavalry/infantry and flank formation requires your opponent to attack on two fronts, which is much harder. Staggered formation makes massed siege much less effective, even if your army moves more slowly and takes up much more room.

Disclaimer: I am not an expert at this game.

Celts age of empires 2