  We construct the ASDYM 1-solitons and multi-solitons for split signature and
interpret them as soliton walls. We show that the gauge group is
$\mathrm{G=SU(2)}$ for the entire intersecting soliton walls, and
$\mathrm{SU(3)}$ for each soliton walls in the asymptotic region. This is joint
research partially with Masashi Hamanaka, Claire R. Gilson, and Jonathan Nimmo.
