Here’s a list of all the motherland codes for quick reference:
RoC:
Human
motherland human 1 - Chapter 1: The Defense of Strahnbrad
motherland human 2 - Chapter 2: Blackrock and Roll
motherland human 3 - *Interlude: Jaina’s Meeting
motherland human 4 - Chapter 3: Ravages of the Plague
motherland human 5 - Chapter 4: The Cult of the Damned
motherland human 6 - Chapter 5: March of the Scourge
motherland human 7 - *Interlude: The Prince and the Prophet
motherland human 8 - Chapter 6: The Culling
motherland human 9 - *Interlude: Divergent Courses
motherland human 10 - Chapter 7: The Shores of Northrend
motherland human 11 - Chapter 8: Dissension
motherland human 12 - Chapter 9: Frostmourne
Undead
motherland undead 1 - Chapter 1: Trudging through the Ashes
motherland undead 2 - Chapter 2: Digging up the Dead
motherland undead 3 - *Interlude: The Dreadlords Convene
motherland undead 4 - Chapter 3: Into the Realm Eternal
motherland undead 5 - Chapter 4: Key of the Three Moons
motherland undead 6 - Chapter 5: The Fall of Silvermoon
motherland undead 7 - *Interlude: The Revelation
motherland undead 8 - Chapter 6: Blackrock & Roll, Too!
motherland undead 9 - Chapter 7: The Siege of Dalaran
motherland undead 10 - Chapter 8: Under the Burning Sky
Orc
motherland orc 1 - Chapter 1: Landfall
motherland orc 2 - Chapter 2: The Long March
motherland orc 3 - *Interlude: The Wreckage of Lordaeron
motherland orc 4 - Chapter 3: Cry of the Warsong
motherland orc 5 - Chapter 4: The Spirits of Ashenvale
motherland orc 6 - *Interlude: The Blood of Mannoroth
motherland orc 7 - Chapter 5: The Hunter of Shadows
motherland orc 8 - Chapter 6: Where Wyverns Dare
motherland orc 9 - Chapter 7: The Oracle
motherland orc 10 - Chapter 8: By Demons Be Driven
Night Elf
motherland nightelf 1 - Chapter 1: Enemies at the Gate
motherland nightelf 2 - Chapter 2: Daughters of the Moon
motherland nightelf 3 - Chapter 3: The Awakening of Stormrage
motherland nightelf 4 - Chapter 4: The Druids Arise
motherland nightelf 5 - Chapter 5: Brothers in Blood
motherland nightelf 6 - Chapter 6: A Destiny of Flame and Sorrow
motherland nightelf 7 - *Interlude: The Last Guardian
motherland nightelf 8 - Chapter 7: Twilight of the Gods
TFT:
Sentinels
motherland nightelfex 1 - Chapter 1: Rise of the Naga
motherland nightelfex 2 - Chapter 2: The Broken Isles
motherland nightelfex 3 - Chapter 3: The Tomb of Sargeras
motherland nightelfex 4 - Chapter 4: Wrath of the Betrayer
motherland nightelfex 5 - *Interlude: Unfinished Business
motherland nightelfex 6 - Chapter 5: Balancing the Scales
motherland nightelfex 7 - Chapter 6: Shards of the Alliance
motherland nightelfex 8 - *Interlude: Malfurion’s Vision
motherland nightelfex 9 - Chapter 7: The Ruins of Dalaran
motherland nightelfex 10 - Chapter 8: The Brothers Stormrage
motherland nightelfex 11 - Finale: A Parting of Ways
Alliance
motherland humanex 1 - Chapter 1: Misconceptions
motherland humanex 2 - Chapter 2: A Dark Covenant
motherland humanex 3 - Chapter 3: The Dungeons of Dalaran
motherland humanex 4 - Secret Level: The Crossing
motherland humanex 5 - *Interlude: The Dusts of Outland
motherland humanex 6 - Chapter 4: The Search for Illidan
motherland humanex 7 - *Interlude: Illidan’s Task
motherland humanex 8 - Chapter 5: Gates of the Abyss
motherland humanex 9 - Chapter 6: Lord of Outland
motherland humanex 10 - Finale: Kil’jaeden’s Command
Scourge
motherland undeadex 1 - Chapter 1: King Arthas
motherland undeadex 2 - *Interlude: A Kingdom Divided
motherland undeadex 3 - Chapter 2: The Flight from Lordaeron
motherland undeadex 4 - *Interlude: Sylvanas’ Farewell
motherland undeadex 5 - Chapter 3: The Dark Lady
motherland undeadex 6 - Chapter 4: The Return to Northrend
motherland undeadex 7 - Chapter 5: Dreadlord’s Fall
motherland undeadex 8 - Chapter 6: A New Power in Lordaeron
motherland undeadex 9 - Chapter 7, Part 1: Into the Shadow Web Caverns
motherland undeadex 10 - Chapter 7, Part 2: The Forgotten Ones
motherland undeadex 11 - Chapter 7, Part 3: Ascent to the Upper Kingdom
motherland undeadex 12 - *Interlude: Boiling Point
motherland undeadex 13 - Chapter 8: A Symphony of Frost and Flame
motherland undeadex 14 - Finale: A Long Time Coming (*This one doesn’t work at the time of this post, not in Classic mode at least.)
Bonus (Orc)
motherland orcex 1 - Act 1: To Tame a Land
motherland orcex 2 - Act 2: Old Hatreds
motherland orcex 3 - Act 3: A Blaze of Glory