Ideal army composition and unit types in eu4

	A	B	C	D	E	F	G	H	I	J	K
1	Ideal army composition for every tech
2	Mil tech	Combat width	Infantry	Cavalry	Cannons	Total	Comments
3	0	15	17	4	0	21	For the reasoning behind this, see Zwirbaum's great unit guide.
4	2	20	22	4	0	26	Or this video by darkfireslide
5	5	22	24	4	0	28	If you find yourself to be a horde you may want to ignore all this and go full cavalry; I'm not sure if that's better or worse than these compositions.
6	6	24	26	4	0	30	Also, if you have insane cavalry combat ability (eg. Poland) you can consider adding more cavalry.
7	9	25	27	4	0	31	If you have any sense of army aesthetics, add one inf to odd numbers for when you split the army up to avoid attrition.
8	11	27	29	4	0	33
9	14	29	31	4	0	35
10	16	30	32	4	30	66	Only from this tech onwards will artillery deal more damage than infantry in fire phase. That doesn't mean it's bad to get them earlier, but they spike in efficiency here.
11	18	32	32	6	32	70	Flanking range increases to 3, making 2 more cavalry useful
12	20	34	34	6	34	74
13	22	36	36	6	36	78
14	23	36	34	8	36	78	Flanking range increases to 4, making 2 more cavalry useful
15	24	38	36	8	38	82
16	26	40	38	8	40	86
17
18	Best unit type for every tech and tech group				According to Zwirbaum		Yellow cells contain notes with nuances			Red cells mean you stick with old units
19	(Groups are sorted alphabetically after Western)
20
21	Western
22	Tech	0-4	5-8	9-11	12-14	15-18	19-22	23-25	26-27	28-29	30-32
23	Infantry	Latin	Galloglaigh	Condotta	Free Shooter	Maurician	Gustavian	Line	Frederickan	Impulse	Drill Infantry
24
25	Tech	0-9	10-13	14-17	18-22	23-25	26-27	28-32
26	Cavalry	Chevauchée	Schwarze Reiter	Latin Caracole	Gallop	Latin Hussars	Uhlan	Latin Lancers
27
28	Tech	7-9	10-12	13-15	16-17	18-19	20-21	22-24	25-28	29-32
29	Artillery	Large Cast	Culverin	Small Cast	Chambered Demi	Leather	Swivel	Coehorn	Royal	Flying Battery
30
31	African
32	Tech	0-4	5-11	12-14	15-22	23-25	26-29	30-32
33	Infantry	Clubmen	South	Plains	South	Central	East	Westernized East African Infantry
34
35	Tech	0-9	10-13	14-17	18-22	23-25	26-27	28-32
36	Cavalry	Abyssinian	Tuareg	Abyssinian	Hussar	Swarm	Dragoon	Cuirassier
37
38	Tech	7-9	10-12	13-15	16-17	18-19	20-21	22-24	25-28	29-32
39	Artillery	Large Cast	Culverin	Small Cast	Chambered Demi	Leather	Swivel	Coehorn	Royal	Flying Battery
40
41	Anatolian
42	Tech	0-4	5-8	9-11	12-18	19-22	23-25	26-29	30-32
43	Infantry	Yaya	Azab	Janissary	Sekban	Janissary	Nizami-Cedid	Carabineer	New Model
44
45	Tech	0-5	6-9	10-17	18-22	23-25	26-27	28-32
46	Cavalry	Musellem	Timariot	Spahi	Reformed Spahi	Toprakli	Skirmisher	Lancers
47
48	Tech	7-9	10-12	13-15	16-17	18-19	20-21	22-24	25-28	29-32
49	Artillery	Large Cast	Culverin	Small Cast	Chambered Demi	Leather	Swivel	Coehorn	Royal	Flying Battery
50
51	Chinese
52	Tech	0-4	5-8	9-11	12-14	15-18	19-25	26-32
53	Infantry	Spearmen	Offensive	Asian	Banner	Mass	Musketeer	Reformed
54
55	Tech	0-5	6-9	10-13	14-16	17-22	23-27	28-32
56	Cavalry	East Asian	Asian Steppe	Reformed	Charge	Banner	Dragoons	Reformed
57
58	Tech	7-9	10-12	13-15	16-17	18-19	20-21	22-24	25-28	29-32
59	Artillery	Large Cast	Culverin	Small Cast	Chambered Demi	Leather	Swivel	Coehorn	Royal	Flying Battery
60
61	Eastern
62	Tech	0-4	5-8	9-11	12-14	15-18	19-22	23-25	26-29	30-32
63	Infantry	Bardiche	Eastern Militia	Pike Infantry	Offensive	Soldaty	Saxon	Petrine	Green Coat	Mass
64
65	Tech	0-5	6-9	10-13	14-21	22-25	26-27	28-32
66	Cavalry	Eastern	Stratioti	Eastern Hussar	Cossacks	Hussar	Lancers	Cuirassiers
67
68	Tech	7-9	10-12	13-15	16-17	18-19	20-21	22-24	25-28	29-32
69	Artillery	Large Cast	Culverin	Small Cast	Chambered Demi	Leather	Swivel	Coehorn	Royal	Flying Battery
70
71	Indian
72	Tech	0-4	5-8	9-11	12-17	18-22	23-25	26-29	30-32
73	Infantry	Footsoldier	Arquebussier	Toofangchis	South Indian	Deccani	Telingas	Sepoy	Drill
74
75	Tech	0-5	6-9	10-13	14-16	17-22	23-27	28-32
76	Cavalry	Elephant	Cavalry Archers	Mansabdar	Mansabdar	Maratha	Deccani	Sowars
77
78	Tech	7-9	10-12	13-15	16-17	18-19	20-21	22-24	25-28	29-32
79	Artillery	Large Cast	Culverin	Small Cast	Chambered Demi	Leather	Swivel	Coehorn	Royal	Flying Battery
80
81	Muslim
82	Tech	0-4	5-8	9-11	12-14	15-22	23-25	26-29	30-32
83	Infantry	Footsoldier	Duel	Shamshir	Musketeer	Afsharid	Reformed	Mass	Mass
84
85	Tech	0-5	6-9	10-13	14-17	18-22	23-27	28-32
86	Cavalry	Muslim	Shayhanid	Qzilbash	Qzilbash	Charge	Ali Bey	Durrani
87
88	Tech	7-9	10-12	13-15	16-17	18-19	20-21	22-24	25-28	29-32
89	Artillery	Large Cast	Culverin	Small Cast	Chambered Demi	Leather	Swivel	Coehorn	Royal	Flying Battery
90
91	Native American
92	Tech	0-4	5-9	10-13	14-18	19-25	26-29	30-32
93	Meso Inf	Spearmen	Hill	Reformed Hill	Hill Musketeers	Guerilla Warfare	Plains	Central
94
95	Tech	0-4	5-9	10-13	14-18	19-25	26-29	30-32
96	North Inf.	Clubmen	Tomahawk	Mountain	Native American	Rifle Scout	Guerillas	Westernized
97
98	Tech	0-4	5-9	10-13	14-18	19-25	26-29	30-32
99	South Inf.	Spearmen	Slingshots	South	Reformed	Incan Guerilla	W. Incan	R. W. Incan
100
101	Tech	0-32
102	Cavalry	Each new unit unlocked will be upgrade over previous ones, so always pick new units.
103
104	Tech	7-9	10-12	13-15	16-17	18-19	20-21	22-24	25-28	29-32
105	Artillery	Large Cast	Culverin	Small Cast	Chambered Demi	Leather	Swivel	Coehorn	Royal	Flying Battery
106
107	Nomad
108	Tech	0-32
109	Infantry	Each new unit unlocked will be upgrade over previous ones, so always pick new units.
110
111	Tech	0-9	10-32
112	Cavalry	Swarm	Each new unit unlocked will be upgrade over previous ones, so always pick new units.
113
114	Tech	7-9	10-12	13-15	16-17	18-19	20-21	22-24	25-28	29-32
115	Artillery	Large Cast	Culverin	Small Cast	Chambered Demi	Leather	Swivel	Coehorn	Royal	Flying Battery