So i've found a really effective way to handle those supply convoys that keeps giving people trouble. First up, you'll want to use either observe or eagle vision to get a good look at how the guards move around, and make sure you spot any commanders or alarm bells. Naoe's definitely better for the sneaky approach here, though yasuke can work if you're good with ranged weapons to thin out the guards first.

Something that works really well is taking out the light sources around the convoy routes. Just hit those lanterns with kunai and you'll get way more shadows to work with, which makes everything easier. Try to stick to the rooftops when you can, but watch out for those noisy floors in some areas they'll give you away faster than you'd think.

The best approach i've found is dealing with the scouts first, since they're usually separate from the main group. A kunai to the head works great, or if you're close enough, smoke bombs make for easy takedowns. Really important to get those alarm systems disabled too before you start taking down the main guard group otherwise you'll have reinforcements showing up real quick.

If things go wrong, having shadow piercer unlocked is a lifesaver, lets you disappear instantly. Weather actually makes a big difference too rain helps mask your footsteps but snow can make rooftop movement pretty tricky so keep that in mind. Make sure you've got your hidden blade upgraded and plenty of smoke bombs, and if you can get armor with the night predator engraving that extra damage in darkness really helps speed things up.