Crossing the mountain pass | Mission 1 - Siege of Tobruk Sniper Elite III Guide

The location of the first secret.

After regaining control over your character (point 5 on the map), press the button responsible for displaying the drop-down inventory screen, and from there select the Med Kit. Patch yourself up and travel to the east. It's worthwhile to scan through the area thoroughly, especially because you won't run into any enemies for a while. There's a secret hidden near one of the corpses of the murdered soldiers - War Diary - Letters to Martin.

It's worth to eliminate the enemies with stealth.

A narrow path located to the east of the place where you've started scouting the area (point 6 on the map) leads to another area. Remain vigilant, as there are two enemies near your immediate vicinity (one of them is a sniper). It would be a good idea to sneak around them (crouch button) and equip yourself with a silenced pistol (Welrod). You, however, don't need to use your firearm here, as getting behind the enemy and silently eliminating him is generally a better idea. After getting rid of both of them, examine their bodies and continue your march.