Harry Potter and the Uncharted Storm

"Ever had that cold feeling that you know you're about to die? That instinct to try and stave off the inevitable for a little while longer? I didn't have that instinct and I knew I was dying." Join James Wolfe and Harry Potter against the forces of Voldemort and plenty of other things, evil and otherwise. SI and crossover elements. AU from the start of PoA. HP/HG OC/?