Assertion: bridgehead | /r/HasProperty | established for force
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Source sentences:
text: Amazingly, not only was this achieved (it is very hard to launch a (double) river assault crossing at the end of a strategic operation; reserves had to be retained throughout the Leningrad offensive) by exhausted troops of the 42nd Army, but the bridgehead was established for a force that quickly enlarged to accommodate an Army force in size.