Enacting an escape plan under such dire circumstances might have been difficult for most folks, but we Foolhardies were used to these kinds of situations. In fact, you could say surviving against all odds was a specialty of ours.
Our retreat had three stages.
The first stage was to set up barricades around the oasis itself to impede the passage of enemies once they've climbed over the northern slope, which at this point was half a winter wonderland already.
Luckily the forces below didn't have any fliers so they had no choice but to struggle and climb. Just wading through slick ice and then an uneven sand slope made even more slippery with blood would buy us a bit of time too.
Included in this first stage were the straw soldiers we'd made to confuse the enemies, but honestly, we'd made them mostly to piss the enemy off.