Been struggling with a World War 1 cipher that for some reason computers can't handle.

This wonderful ADFGVX cipher is giving me a whole host of troubleI don't know either key so it's a big struggle.

XXGGDAXFDFAFDGFAXXFAXAFVAVADXXFFAXXGAAXGFFXXVDAGDGXGDXFDXVFD FGXAVGADGGDFGDDFGXDXVFXAXAAFXAVFXAVXXDDXDDAXFVFXVVGXVAGAX

FADFVAFFDFADAVXFGVVXDDXAAGFVXADDAFDAAAAAAFDDDXVDXVDXGADAGGAXGFDAVDGFAADDAAAFDXFVVAFAAAAFGDVGVDXFGGVXFAAFAVXADAXVFVFDXDDGGGDDFVXXGXDXAAXXXDFFFGAFXDDDAAAFFXDXFAAVFGAVFGGGXAAAFAXDAXFAVXXAADXFFADADGAAFDDAFXXADAFGFXDXDVDADVGAFVDXAXGVXDGVXGGADXFXFADVDAGDFVDVGAADFXDDFAAXFVFAXXXFFADAFVFVADFDAAFAXVADFDFXAGAA \_\_\_\_\_\_\_\_\_\_\_\_\_\_ ADGVVFGAFDXADAXAXFVGDADADFFDXFDFDFDXDAAGDDXFFVVFAAFAVFADDDAFXAVAXGFGVADXDXXFXAAAVDDAAGFVXADDAXFGVFAFGXGFAAGAAXFGDDVFXFAAADXGDGDAXAGDXFDDVGVXDXADVGXDAXFAFVDGXVXDGVDADDFDAXDADAAFDVAADDAAAXAAFXXGAADADFFXXADDAVXAFGFDXDGAFXAXAAXGGFFDFDVVGDFVXXGXDXADFADXFVFVFGXAFVFGDAAADGVDXDFDGAXADADVGVAADVVADGXFFGAVDDFAADXVGAADADDAFDAAAGAXFVXXXADDXAXVAXFFAVFDFDFGFVFFADFADAAVADFAAADXAGAXAXXAFFXADXGDVVDXAXGVXDGVAAFGFAFADDFAFDAXFAFGADFAXADXADAGAXXDDADDFGDVXDFADXFVVXADXX

DGXXDFADADXFAXADDAGDDDXFVDVADFGAGXDFXXXGVDDAVXDFAADFAFAGAAAFVFAAAFXDDFADAXDDAAXFFXDFXFVFFGVDAFXVXXXDAFAADFAADGAADFADFFAXVDXADFDFGGVFVFDDADXAADGGDXFAFXAAFXFAAVFDGADAVDDGDAFDVFDXFXGADAXDVDGXXDAAFGFGFAFVDFXDFXFAAAXXAADXXDGVDVDXFAFAFADDAVDDGDGAFXFGDDFVAAFAAFXXFAFGVDGVAADXFADGDDADFAGVDDFAGXFXFDFGVDXDFDDVXVFAAFFDFVAADVAAGFXXAFDDAAGGDXAXXVFXAVFGXADXGGFXAXAVFAGDAAAADGAAFAFGFGAFDGAVDVADDVFDXGAXAGXXXAAVAGGDADDAAXAAFDFAXGDDADDA

VFDFXFAXDAAFADGXDADFGAVXADDFDDXVVDVDDFGAFDXAFVVFVFGDDGGVDAVDDFGFVFDDXDFFAVVFDDXAADDXADAXGXVXDGVFXVFDFFXGFAXAAVXAFGFVDAADFAFVDADVAAAVAVXVAVFAADADDAGVDAXAX

It's a long one alright.V sbyybjrq gur ehyrf