They were doing nothing but seeing Sacagawea getting kidnapped and sold to a French man.
The Hidatsa kidnapped Sacagawea
They began a skirmish which lead to Sacagawea being captured.
Tsakakawia (incorrectly called Sacagawea by Lewis and Clark) was the Shoshone woman with a Hidatsa name who accompanied the Corps of Discovery.She certainly did not act as a translator until the expedition arrive in the Shoshone country; she could not speak Lakota or Mandan or Blackfoot or any of the other languages encountered on the route. Her major contribution was simply being a woman, since this marked out the expedition as not being a war party. It was this alone that helped the explorers remain safe.
A raiding party is special unit that commits an assault on a village or town. The term is more often used in tribe warfare or battle skirmishes than full out wars.
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Shoes
The raiding party is to be held in abeyance until the scouting party's signal.
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It's called party raiding
Clans are for raiding in party together. The most common is Clan Wars.
Small raiding party
By 711 a speculative raiding party of 10,000 soldiers, led by Tariq ibn-Ziyad, crossed the Straits of Gibraltar and defeated the Visigothic army of King Roderic at the Battle of Guadalete.