Okay help please?

Right driving my international down the road ( diesel by the way) it loses power n then cuts out..soo a bit confuzed i restarted it and carried on driving when it on ly move 20 yard n did the same towed it home n it wont start now the battery wont hold its power n we have tried jump starting it but nothing. Soo please can some one help me with this problem as i am only 15 years old and need that tractor to run r livery yard sooo please help me i do know a fair bit of mechanic n soo does my 40 year old freind hu is allso stumped on what has gone wrong soo help reli would b apprecitated

Many Thankz Ben

Ben Broadhurst
February 2007