After a goalless first half, Lions defender Jake Cooper opened the scoring just before the hour mark after a corner.
The Black Cats then managed to equalise nine minutes from time when Alex Pritchard’s free-kick was converted by Dennis Cirkin.
Mowbray’s side will now prepare for next week’s FA Cup replay against Fulham. Here, we take a look at the best photos of Sunderland fams throughout the day courtesy of Frank Reid:
![Sunderland fans photographed during the 1-1 draw away at Millwall in the Championship. Dennis Cirkin headed the Black Cats' equaliser after the home side took the lead.](https://www.sunderlandecho.com/webimg/b25lY21zOjQ5ZmNkMDIwLTMwYTgtNDk0ZS05YWVjLTBmNzE0YjYyMjlhYjphZTgwMzM2MS1hNmQ2LTRjMmYtYjNjZi02MTE0MzIyYjNmNWI=.jpg?crop=3:2&width=800)
1. Sunderland fans
Sunderland fans photographed during the 1-1 draw away at Millwall in the Championship. Dennis Cirkin headed the Black Cats' equaliser after the home side took the lead. Photo: Frank Reid
![Sunderland fans photographed during the 1-1 draw away at Millwall in the Championship. Dennis Cirkin headed the Black Cats' equaliser after the home side took the lead.](https://www.sunderlandecho.com/webimg/b25lY21zOmI2NmUyYzNkLTY1MTEtNDdhYS05NTI5LWRhOGFhYzFlZTA1OTpjMjg2N2Q3ZC01MGNkLTQ2MzYtODkzMy0yZDU0ZWY1NGI2Nzk=.jpg?crop=3:2&width=800)
2. Sunderland fans
Sunderland fans photographed during the 1-1 draw away at Millwall in the Championship. Dennis Cirkin headed the Black Cats' equaliser after the home side took the lead. Photo: Frank Reid
![Sunderland fans photographed during the 1-1 draw away at Millwall in the Championship. Dennis Cirkin headed the Black Cats' equaliser after the home side took the lead.](https://www.sunderlandecho.com/webimg/b25lY21zOjkyMjY1OTlkLTcxNWUtNDA2OS1iOWE3LTg1ODdlNzM3NzZmOTo1Y2JkYWIzNC0xMDY5LTRjYTQtOTkxMy02MTBmMjM1ODY1OWE=.jpg?crop=3:2&width=800)
3. Sunderland fans
Sunderland fans photographed during the 1-1 draw away at Millwall in the Championship. Dennis Cirkin headed the Black Cats' equaliser after the home side took the lead. Photo: Frank Reid
![Sunderland fans photographed during the 1-1 draw away at Millwall in the Championship. Dennis Cirkin headed the Black Cats' equaliser after the home side took the lead.](https://www.sunderlandecho.com/webimg/b25lY21zOjcxNjM3M2I4LTQ2NzQtNDZkMC1iYjhmLWU1N2I4ZDkyOTVmMjpkMjc4MzgwYi0xYWU5LTQxNGItYTgxMS1jZjc1ZGQxODczYjA=.jpg?crop=3:2&width=800)
4. Sunderland fans
Sunderland fans photographed during the 1-1 draw away at Millwall in the Championship. Dennis Cirkin headed the Black Cats' equaliser after the home side took the lead. Photo: Frank Reid