Planetary Defence Force - Notable Planetary Defence Forces: Agripinaa Home Guard - The PDF of Agripinaa, the Home Guard participated in the defence of Agripinaa against the Forces of Chaos during the 13th Black Crusade in 999.M41.Armageddon Defense Force - The PDF of Armageddon participated in the defence of that Hive World during the multiple campaigns fought against the Forces of Chaos (First War for Armageddon) as well as Ork forces (Second War for Armageddon and Third War for Armageddon).Baran Siege Masters - The PDF of Baran fought alongside the Raven Guard Space Marine Chapter against the remnants of the Ork WAAAGH! of Arbuttz the Incredible. Baran is a fecund world of rolling blue oceans, expansive forests, and rolling steppe land. It was originally an Eldar Exodite world, but was conquered by the Orks of WAAAGH! Arbuttz in the late 40th Millennium. By 224.M41 an Imperial Crusade passed over the world with the intention of liberating it from its Ork overlords. The first assaults quickly established the Imperial forces as masters of the steppe-lands. The Feral Ork tribes fled to the hinterlands. General von Paulus, commanding General of the Death Korps of Krieg's 127th Infantry Regiment, lacked the troops to threaten one area without exposing another, so he had a system of fortifications set up to contain the Orks instead. As the only regiment assigned to the crusade, the 127th Infantry Regiment were given the Right of Settlement of Baran. As human settlers began to arrive, these fortified positions became the basis for Imperial cities, with a curious blend of civilian structures and military fortifications. As generations passed the original conquering regiment died away and was replaced by home grown Planetary Defence Forces. Eventually, these regiments were inducted into the Imperial Guard as the Baran Siege Masters.Cadian Interior Guard - The Cadian Interior Guard defended its homeworld of Cadia against the encroachment of the Forces of Chaos, most notably during the 13th Black Crusade.Erebus Defence Legion - The Erebus Defence Legion defended their homeworld of Tarsis Ultra alongside the Ultramarines 4th Company and the Mortifactors Chapter during the invasion of Hive Fleet Leviathan in 999.M41. This conflict left a terrible mark upon the world, but Tarsis Ultra was finally transformed into an uninhabitable Dead World by the actions of the Iron Warriors' Warsmith Honsou, who unleashed a terrible biological weapon known as the Heraclitus Virus into Tarsis Ultra's Tyranid-altered biosphere.Kaerls - The Kaerls of Fenris fought alongside their feral overlords, the Space Wolves Space Marine Chapter, during the First Battle of The Fang against the Daemon Primarch Magnus the Red and his Thousand Sons Traitor Legion in the 32nd Millennium.Macharian PDF- The Macharian PDF hails from the world of Macharia in the Cadian Sector, named after the great hero and saint, Lord Solar Macharius. They are known for being devout followers of the imperial scripture, adorning their Veterans with purity seals and other religious paraphernalia.Maccabian Militia - The Maccabian Militia of Maccabeus Quintus are a capable fighting force, possessing a proud military tradition which can be traced back to the Angevin Crusade. Their finest warriors are often chosen to serve in the ranks of the Maccabian Janissaries Astra Militarum regiment.Rynnsguard - The Rynnsguard served as the Planetary Defence Force of the planet of Rynn's World, the homeworld of the Crimson Fists Chapter. They suffered horrendous casualties at the time of the invasion of Rynn's World by WAAAGH! Snagrod when much of the Chapter was destroyed.Tartarus Planetary Defence Force - The Tartarus Planetary Defence Force defended their homeworld of Tartarus when it was besieged by Orks sometime during the 41st Millennium. At one point during this conflict, multiple different factions clashed on the planet which included the Orks, the regiments of the Imperial Guard, the Chaos Space Marines of the Alpha Legion, the Eldar of the Biel-Tan Craftworld, and the Space Marines of the Blood Ravens Chapter.Vervun Primary - The Vervun Primary defended their homeworld of Verghast during the Imperium's Sabbat Worlds Crusade against the Forces of Chaos.Ultramar Auxilia - Ultramar possesses a formidable Planetary Defence Force that has a long and proud military tradition that stretches back to the dark days of the Horus Heresy. They have played an instrumental role in the defence of the Realm of Ultramar, most notably during the Battle of Macragge and the Invasion of Ultramar by the Iron Warriors, led by the Warsmith Honsou.