The Battle of Grand Gulf was fought on April 29, 1863, during th: Stress in English is phonemic, and some pairs of words are distinguished by stress. For instance, the word contract is stressed on the first syllable (/ˈkɒntrækt/ KON-trakt) when used as a noun, but on the last syllable (/kənˈtrækt/ kən-TRAKT) for most meanings (for example, "reduce in size") when used as a verb.[160][161][162] Here stress is connected to vowel reduction: in the noun "contract" the first syllable is stressed and has the unreduced vowel /ɒ/, but in the verb "contract" the first syllable is unstressed and its vowel is reduced to /ə/. Stress is also used to distinguish between words and phrases, so that a compound word receives a single stress unit, but the corresponding phrase has two: e.g. a burnout (/ˈbɜːrnaʊt/) versus to burn out (/ˈbɜːrn ˈaʊt/), and a hotdog (/ˈhɒtdɒɡ/) versus a hot dog (/ˈhɒt ˈdɒɡ/).[163]