battleplan

The story

1. Proto-Indo-European*bʰedʰh₂-
2. Latinbattuō
3. Late Latinbattālia
4. Old Frenchbataille
5. Middle Englishbatayle
6. Englishbattle
7. Proto-Indo-European*pleth₂-?
8. Proto-Indo-European*pel-?
9. Proto-Indo-European*pleh₂-
10. Proto-Indo-European*pléh₂-n̥t-eh₂
11. Proto-Italic*plāntā?
12. Proto-Indo-European*pleh₂k-
13. Proto-Indo-European*pl̥h₂nk /*gteh₂
14. Proto-Italic*plānktā
15. Latinplanta
16. Latinplantāre
17. Frenchplanterdeverb.
18. Frenchplant
19. Frenchplan
20. Englishplan
21. English todaybattleplan

From battle + plan.