FT. CAMPBELL, Ky. -- A Fort Campbell soldier injured in a fatal fire on post said he watched helplessly as his wife tried to save the couple's children.

Rebekah Smallwood, 2, and Samuel Fagan, 9, were killed in the May house fire that investigators said was arson.

Spc. Wayne Smallwood, 33, said he shattered his leg jumping from the building to get water to try and put out the fire.

Smallwood said he couldn't stand up to help his wife, Billi-Jo, as she tried to escape to the roof with the three small children.

His wife was badly burned trying to reach the children. The couple's infant child, Nevaeh, was unharmed by the blaze.

Smallwood declined to comment on the investigation of arson, which came after federal investigators ruled out natural and accidental causes of the fire.

Soldiers from Smallwood's unit have established the Smallwood Family Fund at the Bank of America in Clarksville to accept charitable donations.

About 10,000 family members live in housing on post, according to the most recent Fort Campbell fiscal report.