Roos Tarpals was a Gungan Captain who paticipated in several battles including the Battle of Naboo and the Battle of Grassy Plains. During the Clone Wars, he was present when Yoda asked for help from the Gungans for them to send reinforcments to Dac to assist the Jedi. Later, he sacrificed himself in order to capture General Grievous during the Skirmish on Naboo.
Battle of Naboo
Captain Roos Tarpals served in the Battle of Naboo under General Jar Jar Binks. In this battle Tarpals fought bravely along his fellow Gungan citizens against the Confederacy of Independent Systems' droid army. After destroying several battle droids, Tarpals was captured after trying to rescue General Binks however a young Anakin Skywalker managed to save the Gungans by destroying the CIS command ship which deactivating all the battle droids.
Tarpals was present when Jedi Master Yoda requested help from the Gungan people and their Grand Army to aid the Republic in liberating the people of Dac from Separatist forces.
Soon after helping the citizens on Dac, Tarpals was present when Boss Lyonie, under the influence of a necklace, declared that his people should turn against the Naboo and should serve for the Separatist movement. However thanks to intervention from Jedi Knight Anakin Skywalker and senator Padmé Amidala, it was found that Rish Loo was responsible for this and Jar Jar Binks disguised himself as Boss Lyonie to meet with Separatist leader, General Grievous, alongside Tarpals. Jar Jar requested General Tarpals to leave the meeting and contact Padmé Amidala and gather the Gungan army to shut down the battle droid forces. Grievous now trapped attacked the Gungans and Tarpals was almost immediately stabbed by the cyborg general but before dying he managed to stab the general allowing the Gungan Army to capture him.