What does Daniel 8:6 mean?

And he came to the ram that had the two horns, which I saw standing before the river, and ran upon him in the fury of his power.

And he came to the ram that had two horns, which I had seen standing before the river, and ran unto him in the fury of his power.

And he came to the ram that had the two horns, which I saw standing before the river, and ran upon him in the fury of his power.

And he came to the two-horned sheep which I saw before the stream, rushing at him in the heat of his power.

And it cometh unto the ram possessing the two horns, that I had seen standing before the stream, and runneth unto it in the fury of its power.

And he went up to the ram that had the horns, which I had seen standing before the gate, and he ran towards him in the force of his strength.

And he came to the ram that had the two horns, which I had seen standing before the river, and ran upon him in the fury of his power.