I think a little review is in order, here:
After the Oblivion Crisis, Hammerfell remained a part of the Empire during the Stormcrown Interregnum, which ended when Titus Mede seized the Imperial City and was proclaimed Emperor. During the Great War against the Thalmor-led Aldmeri Dominion, Hammerfell fought with the rest of the Empire, and was invaded by the Thalmor forces. When the war ended, Emperor Titus Mede II ceded a portion of southern Hammerfell to the Dominion and outlawed worship of Talos throughout the Empire. The Redguards, outraged, continued to defy the White-Gold Concordat, forcing Titus Mede II to release Hammerfell as its own, independent state.
The Redguards eventually forced a stalemate with the Dominion, leading to Aldmeri forces withdrawing completely from Hammerfell.
http://www.uesp.net/...Lore:Hammerfell
Orsinium was once again sacked by the combined forces of Hammerfell and High Rock in the early Fourth Era, and many Orc refugees fled east into Skyrim. The kingdom reformed, but has relocated; it is now in between Skyrim and Hammerfell.
http://www.uesp.net/wiki/Lore:Orsinium
Prior to her arrival in Skyrim, Saadia, or Iman to use her true name, as revealed during her quest, was a noble belonging to one of the most powerful houses in Hammerfell. According to her, when the Aldmeri Dominion spread to her province, she spoke out against the Dominion and was forced to leave the land. She made her way to Skyrim and arrived in Whiterun to hide. She is hunted down as a fugitive by mercenary soldiers known as the Alik'r. However, the Alik'r claim that Iman betrayed Hammerfell to the Aldmeri and is now wanted for treason.
Her true name, Iman, is the only fact not disputed by either side. Both stories are full of holes and there is no hard evidence to support either case.
http://www.uesp.net/wiki/Skyrim:Saadia
Kematu is the Redguard leader of the Alik'r band that is sent from Hammerfell to capture Saadia, a fugitive who is hiding in Whiterun. He can be found in Swindler's Den. He carries two scimitars and a good amount of gold. He is protected by six Alik'r. He will give you two choices when you meet him in the quest, one to betray Saadia and the other to kill him.
http://www.uesp.net/wiki/Skyrim:Kematu
It does have the makings of an interesting story, no? It also seems like it could be an interesting three-way fight is going on there: Redguards vs. Orcs vs. Thalmor.