What was a major invention that caused massive casualties during the war?

Trench warfare The hand grenade, long used in crude form, developed rapidly as an aid in attacking trenches. Probably the most important was the introduction of high explosive shells, which dramatically increased the legality of artillery over the 19th-century equivalents.

Explanation:

the hyksos invasion. the hyksos were able to attack egypt successfully because of their skills in using bronze weapons, composite bows and the use of the horse and chariot during the invasion. although the egyptians depict a barbarian-type overthrow, the truth is the seizure was likely a relatively peaceful one.

8 years 100% positive

explanation: