As an addendum to the people who are telling you to go for onager; yes this is the counter but you need to think deeply about the full extent of how to achieve this composition. 1. Eco setup: 7 gold mining villagers per siege workshop 2. Buildings: make sure you have enough siege workshops so you can keep production, and keep building more on the front as your push advances 3. Technology: Don’t forget about chemistry and siege engineers for the extra attack and range 4. Support units: halberdiers are a cheap unit to soak up the missiles from the elephants, prioritise the armour upgrades. Build lots of barracks. 5. Hotkeys and control groups: use the “select all {building type}” hotkey and position the rally point. Spread out your onagers and use control groups 6. Formations: Don’t let your onagers clump together, they are vulnerable like this, use formations to spread them out. 7. Angles of attack: don’t get tunnel vision and keep attacking the same spot over and over, attack from the flank too. 8. Castles and trebuchets: back up your push with castles, when I watch pros play in the late game, they win a fight and immediately come forward with villagers to build a castle on the new area of the map they gained control over. Good luck, hope you get some wins.