Battery Light Come On Dash

[Eightpint]

On the way back home last night, the battery light came on the dash, I lost power steering but the car was still driveable so I carried on driving home, what would you think is the first port of call, I’m thinking the alternator, but dont understand the power loss to the steering, any advise welcome

[Eightpint]

Sorted, lifted the bonnet and found the serpentine belts in pieces, brought a new one and had fun fitting it round eight pullies. No skin on knuckles left but car back on road