Research Base - The Road through the Forest (Part 2)

Now that you've taken care of the first 3 men, follow the path around to the right and hide in the bushes...

...to get a good view of the next 3 enemies. The one on the right is a rover, but if you're patient, he'll eventually move back toward the others.

Then you can hit all three with a single poison arrow.

Check out that nice XP bonus. If you don't have poison arrows, you can use distraction—either with arrows or by throwing bottles or cans—to separate the men and kill them one at a time. (Sorry, no screenshots for this.)

Loot the bodies and move away from this area toward the northeast. Scramble up the stone ledge...

...and move into the bushes, since there are 3 more enemies ahead—a pair of soldiers near the truck and a lone guard at the top of the hill. The first 2 soldiers walk to the back of the truck then turn around and come back.

If you wait until they're standing at the front of the truck, you can kill them both with one poison arrow. Or separate them and pick them off as you did earlier.

Finally, take care of the last man, at the top of the hill to the left of the huge gate. His helmet prevents you from getting a headshot.

So if you want that stealth bonus, use a poison or explosive arrow. Noise is OK at this point, assuming you killed the rest of his squad first.

There are more enemies ahead, but you won't encounter them until you clear the big wall ahead. So although Lara stays crouched, you should be safe to explore this area.