Lighter weight, more mobile mountain gun necessary for rough terrain of Serbia. The last photo of a battery in action is probably not composed of 70mm guns, but it is a rare WW1 action shot. ++++++++++ Some general info on the state of Serbian artillery in 1914. From http://www.bulgarianartillery.it/Bulgarian Artillery 1/Testi/T_Serbian guns.htm According with James Lyon, who could consult Serbian archival sources, in August 1914 Serbian Army had only 617 artillery pieces, among them 381 modern quick-firing weapons. Due to the unsettled situation along the Bulgarian and Albanian borders, Serbia was forced to assign some of its scarce artillery in Macedonia, as well as to the eastern border cities of Zajechar, Pirot and Nish. According the Austrian official history of the War, at the outbreak of the War Serbian Field Army had 542 guns. LYON, “A Peasant Mob…”, pp. 491-492, gives this detailed list of Serbian artillery pieces at the beginning of World War 1 (the sum is slightly different from the totals he had given previously in his article, probably because captured and heavy guns are not taken into account) : - 272 quick firing 75mm Schneider-Creusot M. 1907 and M. 1907A field guns, - 12 quick firing 75mm Krupp guns captured from the Turks, - 29 quick firing 70mm Schneider-Creusot M. 1907 mountain guns, - 8 quick firing 75mm Schneider-Danglis mountain guns, - 32 quick firing 120mm Schneider-Canet M. 1910 field howitzers, - 8 quick firing 150mm Schneider-Canet M. 1910 QF howitzers, - 216 slow firing 80mm De Bange M. 1885 field guns, - 18 slow firing 80mm De Bange M. 1885 mountain guns, - 22 slow firing 120mm Schneider-Canet M. 1897 howitzers, - 6 slow firing 150mm Schneider-Canet M. 1897 mortars, - 2 slow firing 120mm long guns captured from the Turks, - 16 slow firing 120mm Schneider-Canet M. 1897 long guns. By August 1914, very little of the artillery ammunition used during the Balkan Wars had been replaced, and Serbia lacked adequate ammunition reserves. The military arsenal at Kragujevac could turn out only 250 to 260 75mm field artillery shells per day, and was able to manufacture only 200 fuses per day. However Serbian arsenal was unable to produce sufficient gunpowder for more than 80 to 100 shells per day. Therefore the majority of the artillery shells was obtained from France and Russia. The first replacement shipments of artillery shells for Balkan War losses begin to arrive only in July 1914.