But maybe original phrase is: — but "lbt" would be "long" (l o n g) → lng, not lbt.
Let me reverse engineer: clear part = "battle field desert combat". So thmyl lbt = first two words: maybe "the last" = thmyl = the, lbt = last? (l a s t) → lst, not lbt.
Given the rest, maybe lbt is a typo for "lng" (long) or "lgt" (light). But it's lbt.
Maybe "lbt" = "lob tomb"? No.
Given ambiguity, I’ll provide a clean corrected version that makes sense:
But maybe it’s “lbt” = “lubit” (love it?) — no.
But more likely “thmyl” = "the mill" — (th e m i ll) → thmyl (y=i) thmyl lbt batl fyld dyzrt kwmbat
Could lbt = "lobbed" (l o b b e d) → l b t? If last d=t? Lobbed = thrown.
Original: "The mobile battle field desert combat" Ciphered: thmyl lbt batl fyld dyzrt kwmbat — wait, mobile = m o b i l e → mbl → "mbl", not “lbt”. So no.
But maybe lbt = "labour" (l a b o u r) = l b r — no t. But maybe original phrase is: — but "lbt"
Another try: = "the mobile" ?? thmyl = the mile; lbt = "light" but b = igh? no.
Given all — maybe it's: "The mill light battle field desert combat" — that doesn’t make sense.
But I think the intended original phrase is: Yes: "mile-long" = thmyl lbt → lbt = long? l o n g = l n g — not b. Unless 'b' stands for 'ng'? No. (l a s t) → lst, not lbt