challenge-heal block hunter IV-wheres the target?

[edsel]

cannot find undead allied soldier (sentinel) to heal block 3 times. only gunner undead allied soldier. anyone find this target? please share location-thank you

[Kardas]

The first wave of Silent Cries in Battlefield has two Sentinel Undead Allied Soldiers. Along with an Assassin Axis Soldier. IIRC this is where I tried for the achievement