Chemical weapons in World War I volatile oily liquid. It was introduced as a vesicant by Germany in July 1917 prior to the Third Battle of Ypres. The Germans marked their shells yellow for mustard gas and green for chlorine and phosgene; hence they called the new gas "Yellow Cross". It was known to the British as "HS" ("Hun Stuff"), and the French called it "Yperite" (named after Ypres). Mustard gas is not an effective killing agent (though in high enough doses it is fatal) but can be used to harass and disable the enemy and pollute the battlefield. Delivered in artillery shells, mustard gas was
Type 312 minesweeper for the People's Liberation Army Navy. Due to its small size, this class is maintained on land and thus is in better conditions than most of other larger boats and ships in the reserve fleet. The drone can be remotely operated from more than away. Type 312 minesweeper The Chinese Type 312 class minesweeper was also known as Futi class. It was the first remote minesweeping drone, and was successfully used in the Vietnam War. Although originally designed as a minesweeping drone, the Type 312 can also be manned by a 3-man crew as a regular minesweeper. The chief designer