Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Defence Line of Amsterdam' has mentioned 'Artillery' in the following places:
Occurrence Sentence Text Source
Concrete structures were shelled with the heaviest artillery available at that time.
They were carefully situated at intervals of no more than 3500xc2xa0m, the spacing being determined by the range of the artillery in the forts.
The combination of fixed positions with the deployment of mobile artillery to the intervals between the forts was also advanced in its application.