There seems to be a slight mix-up.
Are you the 48e or the 21e? Make sure there is consistency in your thread and in your thread title so people aren't confused.
Besides that, I'm sorry to say that there is both a 21e and a 48e already in existence. Both are old regiments, stretching back through NW and into MM. What this means for you is that, unless there is an agreement I don't know about (if that's the case, sorry for the disturbance), you must find a new regiment to name yourselves as. Their pages:
21e, led by marchal davout: http://forums.taleworlds.com/index.php/topic,222773.0.html
48e, led by "48e_Regiment_de_Ligne: http://forums.taleworlds.com/index.php/topic,229184.msg5484412.html#msg5484412
It would be best if you PM then both in case there is some sort of agreement you can work out with either. In any case, good luck, wherever you go with your regiment.