Assertion: fortress's wall | /r/HasProperty | topped by earth banks
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Source sentences:
text: When the newly effective manoeuvrable siege cannon came into military strategy in the fifteenth century, the response from military engineers was to arrange for walls to be embedded into ditches fronted by earth slopes so that they could not be attacked by direct fire and to have the walls topped by earth banks that absorbed and largely dissipated the energy of plunging fire.