Struggle between British and Germans in Africa

One reel (not the first) from a feature film set during the first World War depicting a struggle between the British and the Germans in Africa. A young woman who works for the British is secretly helping her German husband, with the aid of a young boy and an African man. The woman and her husband communicate using messenger pigeons. The woman takes masks down from the wall of her room and leaves the British camp with her two companions. The camera lingers on a boxing match that is taking place outdoors at the camp. The woman delivers the masks to her husband, along with the news that the British plan to erect a munitions depot and occupy all of the locations where water can be procured. She explains to him that she has brought the masks so that he and his men can use them to scare the men driving the munitions truck. They follow her advice and blow up the munitions on the truck. However, they have very little water left and must seek more. Meanwhile, the head of the British camp notices that the masks are missing and warns the German woman that aiding the enemy is punishable by death. The group of German men rides through the desert, desperately seeking water, but the only water they find is undrinkable. They decide to send a message via messenger pigeon. Reel ends.