1 Sentences With "keeps from falling"

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While previous smaller guns could burn down structures with fire, larger cannon were so effective that engineers were forced to develop stronger castle walls to prevent their keeps from falling. This isn't to say that cannon were only used to batter down walls as fortifications began using cannon as defensive instruments such as an example in India where the fort of Raicher had gun ports built into its walls to accommodate the use of defensive cannon. In Art of War Niccolò Machiavelli opined that field artillery forced an army to take up a defensive posture and this opposed a more ideal offensive stance. Machiavelli's concerns can be seen in the criticisms of Portuguese mortars being used in India during the sixteenth century as lack of mobility was one of the key problems with the design.