Template:InfoboxConflict
Here is the updated template with customizable headers for "Group 1" and "Group 2" under participants:
```mediawiki
| InfoboxConflict | |
|---|---|
| Date | |
| Location | |
| Result | |
| Participants | |
| Group 1 | Group 2 |
| Commanders and leaders | |
| Main leaders (Group 1): | Main leaders (Group 2): |
| Casualties and losses | |
| Total dead: |
Total dead: |
```