<prompt> Bhala ukuqhubeka kwalesi sigaba - Ngo-1987, i-SPI yanyathelisa i-Blue and Gray, i-quadrigame yayo yokuqala izimpi ezine ezihlukene ezisebenzisa imithetho efanayo, ezihlanganiswe ebhokisini elilodwa. Izimpi ezine zazinesihloko esithi Shiloh  <response>: i-Antietam, iChickamauga, neCemetery Hill. Lezi zaklanywa uRedmond A. Simonsen, uEdward Curran, no-Irad B. Hardy. Umqondo we-quadrigame wabonakala uthandwa, futhi ama-pre-order wodwa enza i- Blue and Gray ibe ngumdlalo wesibili othengiswa kakhulu we-SPI ngenyanga ngaphambi kokushicilelwa kwawo. Lapho ikhishwa, kwaba umdlalo othengiswa kakhulu we-SPI ngoJulayi nango-Agasti 1975. 