Written in tears, blood, and sweat. 

A new threat from the gloom of the unknown presents itself, and against overwhelming odds, the SGC puts all their training and experience to the test against a foe that is a nameless fear, that the Gou'ld, the Replicators, and even the Ori fear. The fight shall be bloody, costly, and heartbreaking, and entirely inevitable. 

 Nevertheless, the teams must fight on, or be destroyed entirely.

For on the Razor's edge, there is no room to flinch. On the brink of death, there is no time to beg.

But even then, it might still be too costly a fight to wage. 

Still in its early stages Part one is as complete as I can get it at the moment

Based Just after Sam is promoted to Lt.Colonel and takes charge of SG-1.   It is an idea of what may have happened on her first mission incharge