In an horrific opening nine minutes, Josef Bursik had saved a penalty and Paik Seung-Ho had netted a free header from a corner as John Mousinho’s men were steamrollered.
Yet somehow it remained 1-0 at half-time, yet the hosts then added further goals through Tomoki Iwata, Christophe Klarer and Keshi Anderson.
Remarkably, the visiting fans continued to sing through as their team were battered during a miserable second half – and here are our Pompey player ratings...
13. Portsmouth FC forward Marlon Pack (7) under pressure from Birmingham City forward Jay Stansfield (28) during the EFL Sky Bet Championship match between Birmingham City and Portsmouth at the St Andrew's @ Knighthead Park, Birmingham, England on 1 November 2025.
Marlon Pack under pressure from Birmingham forward Jay Stansfield. Picture: Dennis Goodwin/ProSportsImages Photo: Dennis Goodwin
14. Josh Murphy - 5
(Replaced Minhyeok Yang on 53 mins) Gave more attacking threat to Pompey. It wasn't hard. Photo: Graham Hunt
15. Colby Bishop - 4
(Replaced Makenzie Kirk on 53 mins) Gave greater physicality but couldn't impact anything. Photo: Graham Hunt
16. Zak Swanson - 5
(Replaced Ibane Bowat on 53 minutes) Came on as an emergency left-back and was more comfortable than Bowat in that role. Photo: Simon Roe