This morning, a close friend sent me a recording of the Rav's זצ"ל famous remarks on territorial compromise. The remarks were made at the annual Teshuva Drasha, and have been siezed upon, used and misused, by all sorts of people.
Basically, the Rov makes three points. 1) The Six Day War was important because it saved Israel and its Jews. 2) Judaism is not a religion of shrines and dead saints. Thus, concern for Human Life should always trump holy places (the Kotel, Rachel's Tomb, Mearat ha-Makhpela). 3) The question of territorial compromise is best left up to the generals and the statesmen. It's not an halakhic issue.
I agree with all three points, though I may differ with the Rav over the degree of importance one should attribute to sacred spaces in Judaism (I think they are very important. The Rov thought they were less important).
However, Rav Soloveitchik never said that it was a mitzvah to hand over parts of Eretz Yisrael to the Arabs. He had too much respect for other religions and their power to think that the Muslims or the Christians would love us if we would only compromise a bit more. I wonder if he would have said these words if he had witnessed the weakening of Kookian messianism in the wake of the Disengagement from Gaza.
Finally, I really wonder if he would have been so strident if he saw that the Israeli Left (and their Diaspora supporters) are trying to advance a kulturkampf to denude Israel of any Jewish content or significance.
I guess we'll never know.