Warwickshire were left frustrated as Northants continued their resolute second innings batting on day four.
The visitors seemed to be hurling to defeat when, just after lunch on the third day, trailing by 227 on first innings, they hit 148 for five in their second.
But from that point onwards they showed enormous resilience and resolve to bat their way to safety.
The great escape was led by Rossington who dug in to deliver the archetypal captain’s innings – 135 from 399 balls with 17 fours. After adding 159 with Charlie Thurston on the third day, on the fourth, the skipper added an unbroken 200 in 83 overs with Procter (112 not out, 234 balls, 19 fours) to steer his side to 507 for six, their record total against Warwickshire.