His Year 3 is the only attested date for Kamose and was once thought to signal the end of his reign.
However, it now appears certain that Kamose reigned for one or two more years beyond this date because he initiated a second campaign against the Nubians.
Evidence that Kamose had started a first campaign against the Kushites is affirmed by the contents of Apophis' captured letter where the Hyksos king's plea for aid from the king of Kush is recounted in Kamose's Year 3 Second stela:
Do you see what Egypt has done to me?
The ruler who is in it, Kamose-the-Brave, given life, is attacking me on my soil although I have not attacked him in the manner of all he has done against you.
He is choosing these two lands to bring affliction upon them, my land and yours, and he has ravaged them."

 
Two separate rock-inscriptions found at Arminna and Toshka, deep in Nubia, give the prenomen and nomen of Kamose and Ahmose side by side and were inscribed at the same time—likely by the same draughtsman—according to the epigraphic data.
In both inscriptions "the names of Ahmose follow directly below those of Kamose and each king is given the epithet di-ˁnḫ, Given Life, which was normally used only of ruling kings.
This indicates that both Kamose and Ahmose were ruling when the inscriptions were cut and consequently that they were coregents.
Since Kamose's name was recorded first, he would have been the senior coregent.
However, no mention or reference to Ahmose as king appears in Kamose's Year 3 stela which indirectly records Kamose's first campaign against the Nubians; this can only mean that Kamose appointed the young Ahmose as his junior coregent sometime after his third year prior to launching a second military campaign against the Nubians.
As a result, Kamose's second Nubian campaign must have occurred in his Year 4 or 5.
The target of Kamose's second Nubian campaign may have been the fortress at Buhen which the Nubians had recaptured from Kamose's forces since a stela bearing his cartouche was deliberately erased and there is fire damage in the fort itself.

A slightly longer reign of five years for Kamose has now been estimated by Ryholt and this ruler's timeline has been dated from 1554 BC to 1549 BC to take into account a one year period of coregency between Ahmose and Kamose.
 Donald Redford notes that Kamose was buried very modestly, in an ungilded stock coffin which lacked even a royal uraeus.
This may imply that the king died before he had enough time to complete his burial equipment presumably because he was engaged in warfare with his Kushite and Hyksos neighbours.
His Year 3 is the only attested date for Kamose and was once thought to signal the end of his reign. However, it now appears certain that Kamose reigned for one or two more years beyond this date because he initiated a second campaign against the Nubians. Evidence that Kamose had started a first campaign against the Kushites is affirmed by the contents of Apophis' captured letter where the Hyksos king's plea for aid from the king of Kush is recounted in Kamose's Year 3 Second stela:
Do you see what Egypt has done to me? The ruler who is in it, Kamose-the-Brave, given life, is attacking me on my soil although I have not attacked him in the manner of all he has done against you. He is choosing these two lands to bring affliction upon them, my land and yours, and he has ravaged them."
 
Two separate rock-inscriptions found at Arminna and Toshka, deep in Nubia, give the prenomen and nomen of Kamose and Ahmose side by side and were inscribed at the same time—likely by the same draughtsman—according to the epigraphic data. In both inscriptions "the names of Ahmose follow directly below those of Kamose and each king is given the epithet di-ˁnḫ, Given Life, which was normally used only of ruling kings. This indicates that both Kamose and Ahmose were ruling when the inscriptions were cut and consequently that they were coregents. Since Kamose's name was recorded first, he would have been the senior coregent. However, no mention or reference to Ahmose as king appears in Kamose's Year 3 stela which indirectly records Kamose's first campaign against the Nubians; this can only mean that Kamose appointed the young Ahmose as his junior coregent sometime after his third year prior to launching a second military campaign against the Nubians. As a result, Kamose's second Nubian campaign must have occurred in his Year 4 or 5. The target of Kamose's second Nubian campaign may have been the fortress at Buhen which the Nubians had recaptured from Kamose's forces since a stela bearing his cartouche was deliberately erased and there is fire damage in the fort itself. 
A slightly longer reign of five years for Kamose has now been estimated by Ryholt and this ruler's timeline has been dated from 1554 BC to 1549 BC to take into account a one year period of coregency between Ahmose and Kamose.  Donald Redford notes that Kamose was buried very modestly, in an ungilded stock coffin which lacked even a royal uraeus. This may imply that the king died before he had enough time to complete his burial equipment presumably because he was engaged in warfare with his Kushite and Hyksos neighbours.
Kamose