Template:InfoboxConflict

Here is the revised template with Side 1, Side 2, and Side 3 each in their own column, and headers extending across columns:

```mediawiki

{{InfoboxConflict
| image = 
| imageBG = 
| name = 
| nameBG = 
| color2 = 
| date = 
| place = 
| result = 
| side1 = 
| side1_leaders = 
| side1_forces = 
| side2 = 
| side2_leaders = 
| side2_forces = 
| side3 = 
| side3_leaders = 
| side3_forces = 
| casualties1 = 
| casualties2 = 
| casualties3 = 
| notes = 
| references = 
}}

InfoboxConflict
Side 1	Side 2	Side 3

```