HBO

Even Harington, who doesn't like to toot his own horn, had to agree with that sentiment.

"You just know when an episode is good and when it's not, and I felt last night's was really, really, really great episode for the series," Harington tells E! News' Alicia Quarles. "I thought the end product of what they produced for 'Hardhome' was amazing."

According to the Game of Thrones star, the cast and crew worked their butts off to shoot that big battle...and their hard work totally paid off.

"We spent a month filming that sequence which was 20 minutes long," Harington says. "A month, a solid month. It equated to about a minute of footage a day. It was heavy and it was important to me that it worked because it's a really important beat in the Game of Thrones story. I thought it was brilliant. I really, really loved it. I was so proud of it and happy with it. I never pat myself on the back but I thought, why not? It was great!"

Now that's the understatement of the season.

Press play on the video above to hear more from Harington, whose new movie Testament of Youth opens on Friday, June 5th.

Game of Thrones airs Sundays at 9 p.m. on HBO.