Templar convoys can be encountered on main trails throughout the Frontier map at any time after Sequence 05, and are highlighted with the 
icon. Though you are under no obligation to interfere with them, doing so is a rather profitable endeavor.
Convoys are most frequently protected by humble Soldiers, perhaps accompanied by a single Officer, which means that it’s possible to dispatch all guards within less than a minute. Combat can begin once you enter the red Restricted Area that surrounds them, or if you open fire with a ranged weapon. The best attacking strategy is to approach from the rear or above, and open hostilities with assassinations (
01). Once you have dispatched the guards, you can approach the rear of a wagon and press 
/
to rifle through it for a standard £750 reward. You can repeat this with a second wagon on larger convoys for a total reward of £1500: a fair payment for relatively little effort.
Late in the main storyline, you will encounter situations where a Templar convoy consisting of Redcoat troops see Patriot patrols. When hostilities ensue – either without Connor’s direct involvement, or after a cunningly timed intervention to act as a catalyst – you may even get to help yourself to
the reward without drawing a weapon. Looting a convoy in this fashion, or by simply neutralizing its escorts with non-lethal unarmed attacks, will lead to the award of the Prince of Thieves Achievement/Trophy.