This photograph (taken circa 1914) shows an Ottoman gun crew loading a cannon, somewhere on the Caucasus front with Russia. The artillery piece is fairly small, probably a mountain gun, designed for transport over rough terrain.
The Ottoman Empire entered the war on the side of Germany and Austria and soon learned that it was a colossally stupid decision. Despite lacking lacking heavy industry and being without a modern transportation network, and ruling over a number of rebellious and discontented ethnic groups, the dying Ottoman Empire voluntarily went to war with all of the Super Powers of the day and was fighting on multiple fronts, a task which would have sapped the strength of even a major power.
Ottoman troops were fighting in Egypt (later pushed back into Palestine), in Gallipoli, against Romania and Greece, against Britain in Iraq, and against the Russian Empire in the Caucasus. Despite the heavy odds against it, the Ottomans actually took the offensive in many areas, including the Caucasus region. However even the otherwise hapless Imperial Russian Army was able to push back the Ottomans and to hold them at bay even until the Russian collapse following the Communist Revolution.