day 3 had actually ended with arjuna slaying large portion of kaurava army and the soldiers withdrew thinking arjuna is invincible
day 4
1)Abhimayu repelled attack from 5 warriors at one time Aswatthama, Bhurisravas, Salya, Chitrasena and the son of Chala
2)Duryodhan sent a large force of elephants against Bhima and Bhima slew many of them while the rest caused a stampede in kaurav army
3)Then Bhima killed eight of duryodhan's brother's
4)Then duel took place between duryodhna and bhima in which duryodhan injured bhima seeing which Gatotkacha started wrecking havoc on kaurava army
5)Seeing that Bheeshma realized that its not possible to stop Gatotkacha today and during the night he even grows stronger and withdrew his army for nightly rest
day 5
1)Bheeshma starts killing a lot of pandava army and arjuna tries to stop him
2)Drona also fiercely attacks pandav army and satyaki is unable to handle it since he is bearing the major brunt of it .Bhima comes to help him
3)Duryodhan sends many soldiers against Satyaki but Stayaki kills them all then a duel takes place between Bhurisravas and stayaki in which stayaki is losing but bhima again takes him away
4)Arjuna kills several soldiers sent against him by duryodhan
day 6
1)Bhima enters enemy lines to kill kauaravs
2)Dhrishtdyumna becomes worried when he is unable to see Bhima and his chariot and enters the enemy lines as well to see Bhima surrounded by enemies
3)Dhrishtdyumna takes Bhima on his chariot and Duryodhan orders warriors to attack Bhima and Dhristdyumna
4)Dhrishtdymna releases weapons to repel the attack and duryodhan releases counter weapons
4)Reinforcement send by yudhishtir and led by abhimanyu reaches there to help Bhima.Bhima kills more kauravas
5)Drona kills dhrishtdymna's charioteer and smashes his chariot and causes havoc in pandav army
6)Duel takes place between bhima and dury and dury falls unconscious and is saved by kripa and bheeshma and latter slaughter's panadav army
Day 7
Not much happened there were many duels arjuna fought with Bheeshma both were equal,Drona defeated virata and ashwathma defeated shikhandin,drishtdyumna attacked duryodhan and killed his horses,Nakula and sahdev injured shalya and at the end all panadavs fought against Bheeshma
Day 8
1)Bhima killed 16 kauravas
2)Arjuna lost his son Iravan and broke down
3)Gatotkacha after seeing Iravan killed fiercely attacked kaurva army
4)Duryodhan led an attack against Gatotkacha and killed many warriors on Gatotkacha's side
5)Bheeshma sent a force under drona to support Duryodhand and Yudhishtir sent Bhima to help Gatotkacha
ps these are just the highlights feel free to add more