They hit each others with arrows. Seeing that Drishtadyumna was dominating, Duryodhana's brothers surrounded him. Shikhandi held off Kritavarma and Kripa.

Shalya meanwhile was proving to better the four Pandavas together. Satyaki too lost his chariot #Kurukshetra #Day18

Returning on another chariot, Satyaki took it upon himself to stop Shalya. He pierced Shalya with sharp arrows and was wounded back in return. The Pandava brothers supported him. The arrows released in the process covered the sky. Shalya could not be stopped
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Shalya was stationed near Yudhishtira like saturn near the moon (cc @NileshOak @mmpandit )
He calls his brothers and Krishna to re-array the formation and announces that he would lead the battle next. Satyaki and Drishtadyumna protect his wheels #Kurukshetra #Day18

Arjuna stays in the rear and Bhima advances in the front. Twins form the flanks.

The Kaurava side is ready to respond. Shakuni and his brothers engage Satyaki, Drishtadyumna and the twins while Duryodhana himself fights Bhima
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Duryodhana cuts Bhima's standard and bow. Bhima then hurls a javelin that pierces him in the chest and makes him faint. Bhima then kills Duryodhana's chariot.
Kripa and Kritavarma try to rescue Duryodhana as the horses carry him away
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