The Battles of Warriors

Into the Wild
1. RiverClan battles ThunderClan at Sunningrocks. The badly outnumbered ThunderClan patrol, led by Redtail, is forced to retreat.
2. ShadowClan reveals that they drove WindClan out of the forest for refusing to give up territory and hunting rights.
3. ShadowClan launches a raid on ThunderClan camp and are driven off, but not before they manage to kill Lionheart and Rosetail.
5. ThunderClan, aided by exiled ShadowClan elders and warriors, attack ShadowClan's camp and oust Brokenstar and his followers.

Win-Loss ratio of each Clan:
1. RiverClan (1-0)
2. ThunderClan (2-1)
3. ShadowClan (1-2)
4. WindClan (0-1)

Fire and Ice
1. A RiverClan patrol attacks returning WindClan cats, along with Fireheart and Graystripe. RiverClan retreats after the arrival of a ThunderClan patrol and the death of Whiteclaw.
2. Brokenstar and his band of rogues attack ThunderClan while most warriors are out on patrol. The rogues are fended off and Brokenstar is taken prisoner.
2. WindClan is attacked by both RiverClan and ShadowClan. ThunderClan arrives to their aid and helps drive the attacking Clans off.

Win-Loss ratio of each Clan:
1. ThunderClan (4-1)
2. WindClan (2-1)
3. RiverClan (1-2)
4. ShadowClan (1-3)
5. Exiled Rogues (0-1)

Forest of Secrets
1. ShadowClan and WindClan attack ThunderClan for sheltering Brokentail. ThunderClan drives them off.
2. A band of rogues, led by Tigerclaw, attack the lightly guarded ThunderClan camp. A RiverClan patrol arrives just in time to help and Tigerclaw is thwarted and banished.

Win-Loss ratio of each Clan:
1. ThunderClan (6-1)
2. RiverClan (2-2)
3. WindClan (2-2)
4. ShadowClan (1-4)
5. Exiled Rogues (0-2)

Rising Storm
1. Tigerclaw and Brokentail's old band of rogues attack a ThunderClan patrol near the border. Tigerclaw reveals himself after Fireheart discovers Runningwind's body and another fight breaks out, but with the help of a RiverClan patrol, the rogues run away.

Win-Loss ratio of each Clan
1. ThunderClan (7-1)
2. RiverClan (3-2)
3. WindClan (2-2)
4. ShadowClan (1-4)
5. Exiled Rogues (0-3)

A Dangerous Path
1. RiverClan attempts to take Sunningrocks to repay the debt ThunderClan owes them. A battle breaks out and ThunderClan is victorious, forcing RiverClan to retreat.

Win-Loss ratio of each Clan
1. ThunderClan (8-1)
2. RiverClan (3-3)
3. WindClan (2-2)
4. ShadowClan (1-4)
5. Exiled Rogues (0-3) (absorbed into ShadowClan)

The Darkest Hour
1. ThunderClan infiltrates TigerClan camp to rescue four RiverClan cats being held prisoner for their half-clan blood. The group escapes with three of the prisoners, but are caught by a TigerClan patrol before they can cross back over the border. A ThunderClan patrol arrives to their aid during the skirmish and the ThunderClan cats escape.
2. TigerClan attacks WindClan and kills an apprentice as a warning.
3. Following Tigerstar's death, all four Clans unite to resist a group of rogues called BloodClan. Scourge is killed and the other BloodClan cats scatter, being chased back to Twolegplace by WindClan.

Win-Loss ratio of each Clan
1. ThunderClan (10-1)
2. RiverClan (4-4)
3. WindClan (3-3)
4. ShadowClan (3-5)
5. BloodClan (0-1)

This is just in the first series alone.

Do you see a pattern here?
I see a pattern.