Assertion: regiment's element | /r/CapableOf | participate in the marias massacre
Facets:
value: in the montana territory
type: LOCATION
value: on 23 january
type: TEMPORAL
Source sentences:
text: On 23 January 1870, elements of Companies F, G, H, and L participated in the Marias Massacre in the Montana Territory, where 200 Piegan Blackfeet Indians were killed.