If your ancestor obtained a United States military warrant which was used to acquire property in the federal domain, consider obtaining a copy of the application for the warrant. These applications are housed at the National Archives and should contain documentation of a soldier’s service. If the widow applied for a warrant after the soldier’s death she would have needed to prove her marriage also.  Copies of the warrant applications can be requested through the National Archives. They are not online.
It can be hard to get transcription and writing variants on a new family where you have not located records before. To get ideas of potential handwriting variants and transcription mistakes, consider writing the name in a sloppy fashion and having someone else who does not know what the name is read it. This may give you some variations you had not thought to look for.
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