Contracts are a type of aspect quest in Forbidden West. They ask you to collect a specific item from a specific type of machine. The Convoy Ambush contract calls for you to take on a swarm of machines in a ravine. Prepare yourself for a fight. In Horizon Forbidden West, this is how you complete the Convoy Ambush contract.
Larend gives you the Convoy Ambush contract. After conversing with Keruf in Barren Light, you can unlock the contracts. Larend is looking to make some armour, but he needs you to put it together. To get the Contract, speak with him west of Barren Light. You’ll then want to head southwest from Larend’s position to Latopolis. The ravine might be anywhere about there. The scenario is also depicted on the map above.
Once you’ve reached the ravine, it can rescue you on the campfire before the combat begins. Arrange your belongings inside the confines of the room. To obtain the plating from its Crate, you’ll most likely have to take down a Shell-Walker. Take a break at the camp. When you wake up, the convoy will most likely be gone. Use the rock traps in the area to your advantage.
Remember to fire the Crate off the Shell-Walker before killing it. Otherwise, the Crate will be destroyed. After you’ve gathered the plate, return to Larend to get your prize.