Here are the shows in which the ROH/CZW war took place
ROHHell Freezes Over (Danielson vs. Hero for the ROH Title)
Tag Wars 2006 (Brawl ensues causing Cornette to lose a tooth)
IDK if anything happens at Dissension or Unscripted 2, I have yet to watch both
Fourth Anniversary Show (Hero and Necro crash ROH's birthday party)
Arena Warfare (First ROH show in the ECW Arena, CZW roster attacks, including Super Dragon)
Best in the World, Dragon Gate Challenge, Supercard of Honor, Better Than Our Best (All four shows are AWESOME, and include sporadic appearances by Hero and Necro)
The 100th Show (First official CZW vs. ROH match, Claudio turns on ROH)
Weekend of Champions Night 1 (CZW vs. ROH 8 Man Tag)
Weekend of Champions Night 2 (BJ Whitmer vs. Super Dragon, Samoa Joe vs. Claudio Castagnoli)
How We Roll (Kings of Wrestling vs. Pearce/Whitmer)
Ring of Homicide (Homicide comes in as the ROH savior, Necro vs. Joe)
In Your Face (Pearce vs. Claudio, Hero vs. Homicide)
Throwdown (Pearce vs. Necro in a Falls Count Anywhere match, Claudio vs. Homicide)
Chi-Town Struggle (BJ Whitmer, Adam Pearce, & Ace Steel vs. Necro Butcher, Claudio Castagnoli, & Nate Webb, Homicide quits ROH)
Death Before Dishonor IV (The amazing Cage of Death match to end the feud, Bryan Danielson defends the ROH title against Sonjay Dutt)
War of the Wire II (BJ Whitmer and Necro in a No Roped Barbed Wire match)
CZWAn Afternoon of Main Events (Danielson/Hero confrontation)
When 2 Worlds Collide (Ruckus, Eddie Kingston & Necro Butcher vs. Matt Sydal, Roderick Strong & Austin Aries)
Any Questions? (Necro Butcher & Super Dragon vs. Kevin Steen & BJ Whitmer)
Best of the Best 6 (Loads of matches featuring ROH regulars)
I hope that all helps.