The naval periscope was a French invention. A French inventor, Edme Hippolyte Marie-Davy, created the first periscope for naval use in 1854...
Speaking of periscopes, this is 1915, and the Australian military's most significant military undertaking, the Gallipoli Campaign. It was a costly and ultimately unsuccessful operation against the Ottoman Turks. The landing at Anzac Cove on April 25, 1915, marked the beginning of a grueling eight-month campaign. Australian soldiers faced heavy casualties, including over 8,000 killed and 18,000 wounded, as they struggled to make headway on the peninsula...