Skirmish at Amon Hen

The Skirmish at Amon Hen between the Fellowship of the Ring and a small force of Orcs led by Uglúk was fought during the Third Age at Amon Hen. It resulted in the death of Boromir, and the breaking of the Fellowship.

The battle
The Skirmish at Amon Hen started when the Fellowship went searching for Frodo and Boromir. Boromir along with Merry and Pippin found Orcs heading their way. Boromir blew his horn and Aragorn, Legolas, and Gimli ran to help their friend. Meanwhile Frodo took the opportunity to flee and went to their boats, unknowingly with Sam on his tail. Boromir fought valiantly redeeming himself for trying to steal the One Ring from Frodo. However Bormir soon fell to many arrows, and Merry and Pippin were captured. And with Frodo and Sam heading off to Mordor on their own, and Aragorn, Legolas, and Gimli setting out to rescue Merry and Pippin, the Fellowship was broken.

The film
In Peter Jackson's film the orcs are led by Lurtz who killed Boromir and then dueled with Aragorn. In addition, Merry and Pippin, created a diversion so that Frodo could escape. This led them to Boromir, with Orcs nor far behind.