unknown tree's-help

hello,i need help identifying these tree's i have in my garden,each is roughly 13 ft tall,and i have pulled out loads of little ones that were growing on the other side of the garden plus one growing out of the bottom of the shed!
they drop their leaves in autumn,the leaves are opposite,bark is green
any idea's,replies,greatly appreciated,thank you

 

Looks like ash (Fraxinus excelsior) to me...

 

ASH alright. Dig em up and put something more attractive in.

 

thank you kalmia _latifolia and man of leisure MOL, think you're both right-many thanks
looked it up and it all fits!!
i will dig them up as they're not too attractive,i've got too many and its seems more and more just want to grow and my gardens not big enough for the height they will get to.
guess i've got my work cut out,already taken out a plum and lilac tree this week,so 5 more to go!