Julie,
I may be saying something that has already been expressed and if that is the case. I'm sorry. However since I have been warned off opening some of the WWW, that is a possibility.
Dagshai was an important military base in the foothills of the Himalayas and is on the railway line from Kalka to Simla.
In the India Library at the National Library in St. Pancras, London there are several volumes on monumental inscriptions and some cover that area. I think this might help and give you some new ideas. Just in case you are not familiar with this library, you cannot just walk in. If you take your passport and possibly a service invoice addressed to where you live, you can get a readers ticket there and then. I wouldn't want you to make a wasted journey.
Good luck, Toby