I re-watched the "War in Heaven" project in order to get an idea of where to put that event into the timeline. I'm not entirely sure when exactly it occured, but my first guess is that the War in Heaven is the second war of the Saurians against the Anunnaki.
Here are some important points:
1. The remote viewers describe tall white skinned ETs on one side of the conflict. These tall whites often appear to be bald or short haired, wearing tight blue uniforms. Lacerta also describes tall whites with blonde hair:
"The 'Illojiim' came from this universe, from the solar system you call 'Aldebaran' in your maps. They were a very tall humanoid species whit usually blonde hairs and a very white skin (they avoided the sunlight, because it hurted their skin and their eyes. This was absolutely unbelievable for a sun-loving species like us)."
The remote viewers describe the tall whites as human-like beings, but also not human. This could fit into the picture that they created humans using their own genes. They also have smaller grey beings around them who seem to be servants or slaves. The remote viewers describe them as emotionless and somehow robotic.
2. On the other side of the conflict, the remote viewers, especially Aziz, describe reptilian looking beings (he seems to be good at spotting how they look). These reptilians feel aggressive and dangerous. Interestingly, the reptilians seem to use the same grey beings as servants. These reptilians could be the Saurians from Earth.
3. There are also human looking subjects with olive skin on the ground, which seems to be Mars. Interestingly, Mars is attacked by the tall whites, suggesting that Mars was populated by the Saurians. This would fit into Lacerta's narrative that her kind was able to colonize several planets in the solar system. The olive skin humans could belong to the 5th or 6th version of humans created by the Anunnaki.
4. The planet called Maldek – which was sitting between Mars and Jupiter – was destroyed in that war, resulting in a cataclysm on Mars, as rocks from the broken planet hit Mars and destroyed its surface.
According to Lacerta, her people had colonized Moon, Mars, Venus and 4 moons of Jupiter and Saturn. Maldek is not on that list. At 2:34:58 in the video, Melena Hall provides a drawing of the subjects living on Maldek before it was destroyed, which could be the Anunnaki.
All in all, there's not enough information to be sure about anything. The War in Heaven could have taken place earlier. But I'm somehow sure that the tall white beings are the Anunnaki who created modern humans.