According to description of unique ability at Level 4 Upgrade:
If there is an active ally Shield Generator: Gungan Allies can't drop below 100% Health while they have protection.
But in TW I used Omi Wampa with Wampa DC, and slice through Gungans under protection directly to Health due to Lvl9 DC upgrade.
Video file attached in a YouTube link due to big size of a file
https://youtu.be/jhY_6Lb3Ph0?si=WqrZ0vQW6PwCuGqe