The two accounts can be reconciled very easily. The elves are upset at human domination of the world, and attack at Red Crossing
That doesn't reconcile the differences between the two accounts. At the time, the Dalish had their own homeland: the Dales. As for the elven historical account, the codex entry on the Dales (for the Dalish Warden) reads: "But it was not to last. The Chantry first sent missionaries into the Dales, and then, when those were thrown out, templars."
According to the History of the Elves entry expands on this by addressing that the attack on Red Crossing was in provocation to the forced conversion of the elves attempted by the missionaries and their templars: "It was a home, a new chance to gather and rebuild all that we had lost. In our centuries of slavery we had lost our immortality, our language, our culture, our crafts… but never our sense of belonging to each other. From across Thedas we came to the Dales. We walked on foot, sometimes crossing thousands of miles with naught but our will to sustain us. Many of us perished on the Long Walk, but those of us that arrived at our new home were all the more determined.
"There, in the Dales, our people revived the lost lore as best they could, and even turned to worship the old gods in their ancient prison. They called their first city Halamshiral, 'the end of the journey,' and founded a new nation, isolated as elves were meant to be. They created an order called The Emerald Knights and charged them with watching the borders for trouble with the humans.
"But you already know that something went wrong. Our ancestors' worship of the old elven gods angered the human Chantry, which constantly sent missionaries to our land. The Chantry wanted to convert our people to their worship of the Maker, but the Dalish would not submit. In protest, a small elven raiding party attacked the nearby human village of Red Crossing, an act that prompted the Chantry to attack and, with their superior numbers, conquer the Dales. We were not enslaved as we had been before, but our worship of the ancient gods was now forbidden. We were allowed to live among the humans as second class citizens and worship their Maker, slowly forgetting once more the scraps of lore we had maintained through the centuries. Those that refused were forced to wander, landless and friendless in their wagons, across a world that told them they were unwelcome.
Two homes we elves have lost, but it is the loss of the Dales that hurt us most. When I see the vhenadahl, the 'tree of our people', that is planted in the middle of our poor alienage here in the human city… I weep. It is a strong and mighty tree with many branches, but it bears only bitter fruit." - The tale of “The Rise and Fall of the Dales,” as told by Sarethia, elder of the Highever Alienage.