Detail: In 1914 warfare had changed with the use of powerful
guns.

machine

Explanation: WW1 led to the use of machine guns in a wider context, something that had not been seen before.

frederick the great and the war of austrian succession. frederick william of brandenburg-prussia trained his son, frederick, to be a hardy soldier. he also declared himself king of bohemia, and maria theresa sent troops to retake bohemia. in august he led 80,000 of these men across the frontier into bohemia, his