No, an alto horn is not a woodwind instrument, it is a brass instrument. Woodwind instruments use reeds, except for flutes and recorders.
No it is not. An English Horn or Cor Anglais (French) is a woodwind instrument.
No, it is a brass instrument. It's mellow tone blends quite well with woodwind instruments. The french horn section is often orchestrated with the woodwinds (as well as the brass).
The English Horn is a variant of the Oboe. It has a double reed and is pitched five notes lower then the oboe (F).
English horn is basically a big oboe, pitched in F like the French horn...it is not a brass instrument in any way...it was made from the oboe