Ten Things You Might Not Know About World War I-- Part 3

7.  Submarines made their first major impact on this war.  German U-Boats operated mostly on the surface, but submerged to attack.  Germany's open submarine warfare was a major factor in the U.S. joining the war on the Allied side, especially after the RMS Lusitania was sunk.

8.  France, not Germany, was the first country to use tear gas against enemy troops.  In August 1914they fired the first gas grenade (xylyl bromide) against German troops

In January 1915, Germans used tear gas against Russian troops, but the gas turned to liquid in the cold air.  In April 1915, Germans fired off the first poisonous chlorine gas.

Two More to Come.  --Cooter