The noun (Substantiv/Nomen) Einmarsch is masculine in German. Therefore, the correct definite article in the nominative singular is der. So, you say: der Einmarsch.
(entry march)
This word is composed and its gender is always determined by the root word.
Das feierliche Betreten eines Raumes, einer Arena oder eines Stadions, oft durch eine Gruppe von Personen.
The ceremonial entry into a room, arena, or stadium, often by a group of people.
Der Einmarsch der Athleten war sehr beeindruckend. Der Einmarsch der Soldaten wurde von Musik begleitet.
The entry of the athletes was very impressive. The soldiers' entry was accompanied by music.
German grammatical gender can be tricky at first, as it doesn't always seem logical - like with the neuter 'das Mädchen' (the girl). But here's the good news: Even though you won't find a rule for every word and some things just need to be memorized, there are quite a few helpful patterns and rules! These are real guideposts and can make your life significantly easier. So it's definitely worth knowing them!
Nouns ending in -ant are usually masculine. Common in words of Latin/French origin, often describing people or technical/scientific terms
Nouns ending in -ast are usually masculine. Usually found in scientific or technical terms, often from Greek/Latin origins
Nouns ending in -ich are usually masculine. Common Germanic suffix, often in everyday vocabulary and adjective-derived nouns
Nouns ending in -ig are usually masculine. Germanic suffix forming nouns from adjectives or verbs, often describing containers or enclosed spaces
Nouns ending in -ling are usually masculine. Forms nouns describing people or things with certain characteristics, often with diminutive or derogatory meaning
Nouns ending in -or are usually masculine. Latin origin, typically describing machines, devices, or professional roles
Nouns ending in -us are usually masculine. Latin/Greek origin, common in scientific, academic, and cultural terms
Strong Verb Nouns: Derived from strong verbs, describing the action itself or its result are usually masculine. Very reliable rule in German
Examples:
Cars: Car brands and models are generally masculine in German
Examples:
Currency: Most currency names are masculine, except for a few notable exceptions
Days, Months, and Seasons: These temporal nouns are consistently masculine
Male Persons: Nouns referring to male individuals are masculine
Examples:
Mountains and Mountain Ranges: Most mountain names are masculine, except for specific ranges
Non-German Rivers: Rivers outside German-speaking countries are typically masculine
Nouns ending in -gang are usually masculine. Typically describing paths or processes
Examples:
Nouns ending in -mut are usually masculine. Typically describing states or qualities
Examples: