Share This Article 1. In April 1922 Germany and this country signed a treaty of trade and friendship. Soviet Union Sweden Italy Austria 2. The largest grand artillery battery ever formed on the North American continent was at this battle. The Battle of Vicksburg The Siege of Petersburg The Battle of Gettysburg The Battle of Cold Harbor 3. In 1886 France became the first to experiment with these for military use. Submarines Motorcycles Automobiles Bicycles Loading …