Ishant (3/31), leading Delhi for the first time, marshalled his resources well on a benign Kotla track that didn't have much to offer.
Another impressive performance came from left-arm pacer Khejroliya (1/46 in 18 overs), who produced decent pace with a 70 plus over old SG Test ball.
It was sheer pace that sent Assam skipper Gokul Sharma's (51 off 172 balls) stumps cartwheeling. Kulwant was hitting the deck hard and getting deliveries to rear up awkwardly where some of the others couldn't get it above knee roll at times.
Ishant looked rusty in his first spell but then got into a decent rhythm in his second spell as he got Shib Sankar Roy (11) to edge one to Unmukt Chand in the slip cordon.
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The India speedster's second victim was Tarjinder Singh (16) who was trapped plumb in front in post lunch session.
Off-spinner Pulkit Narang (1/39 in 23 overs) trapped Wasiqur Rahaman leg before leaving Assam reeling at 115 for five.
It was Gokul and Sarupam Purkayastha (57 batting), who added 58 runs for the sixth wicket to salvage some pride.
Brief Scores:
Assam vs Delhi:
Assam 224/7 (Gokul Sharma 51, Sarupam Purkayastha 57 batting, Ishant Sharma 3/31) vs Delhi.
Railways vs Uttar Pradesh:
Railways: 182 all out in 76 overs (Ashish Yadav 53, Nitin Bhille 42; Ankit Rajpoot 3/30, Zeeshan Ansari 3/78).
Hyderabad vs Maharashtra: No play due to rain.