ˈoʊnli tˈuː jˈuːnɪts ʌv ˌʌp tʊ ˈeɪt stɹˈɛŋθ pˈɔɪnts kæn biː stˈækt ˌɔn ɐ hˈɛks, ænd ˈoʊnli ðə tˈɑːp jˈuːnɪt kæn fˈaɪɚ ænd tˈeɪk dˈæmɪdʒ.
Only two units of up to 8 strength points can be stacked on a hex, and only the top unit can fire and take damage.