Mille milites in campo stant.

Because milites is in the nominative plural, which is the case commonly used for the subject of a finite verb. The verb stant is also plural, so milites and stant match: the soldiers stand.

In other words:

• milites = soldiers as the subject
• stant = they stand

So the grammar clearly tells you that the soldiers are the ones doing the action.

Stant is the 3rd person plural present active indicative of sto, stare, meaning to stand.

So stant means:

• they stand
• or, depending on context, they are standing

Because the ending -nt marks 3rd person plural, Latin does not need a separate word for they.

Latin usually does not need a separate subject pronoun when the verb ending already shows the person and number.

Here, stant already means they stand, so adding a pronoun would usually be unnecessary.

That is very normal in Latin:

• sto = I stand
• stas = you stand
• stat = he/she/it stands
• stant = they stand

So milites names who they are, and the verb ending confirms it.

Because mille meaning one thousand is normally used as an indeclinable adjective with a plural noun in the same case.

So:

• mille milites = one thousand soldiers

But when Latin uses milia for thousands, the construction changes:

• duo milia militum = two thousand soldiers

So the pattern is:

• mille + noun
• but milia + genitive plural

That is why mille milites is correct here.

Because mille is just the standard Latin word for one thousand. Even though the number is large, the word itself does not change here.

The plurality is shown by milites, which is plural, and by stant, which is also plural.

So Latin is not saying one soldier; it is saying one thousand soldiers, with milites carrying the plural form.

Because in takes the ablative when it means in or on in the sense of location.

So:

• in campo = in the field

By contrast, in takes the accusative when it means movement into something:

• in campum = into the field

So the sentence uses campo because the soldiers are standing in the field, not moving into the field.

Campo is ablative singular.

Its dictionary form is campus, -i, a second-declension masculine noun, meaning field.

So the forms are like this:

• campus = nominative singular
• campi = genitive singular
• campo = dative or ablative singular
• campum = accusative singular

In this sentence, campo is ablative because it follows in with the meaning of location.

Not always. Sto, stare often does mean stand, but depending on context it can also mean something like:

• remain
• stay
• be positioned
• be stationed

In a military sentence, Mille milites in campo stant could suggest not only that the soldiers are literally standing, but also that they are drawn up or stationed in the field.

At a beginner level, though, stand is the best basic meaning.

Yes. Latin word order is much more flexible than English word order because the endings show each word’s role.

This sentence could be rearranged in several ways without changing the basic meaning, for example:

• In campo mille milites stant
• Milites mille in campo stant
• Stant in campo mille milites

The most neutral order here is quite natural, but moving words around can change emphasis more than meaning.

For example:

• In campo first emphasizes where
• stant first can sound more dramatic or literary
• mille milites first emphasizes who is there

Because Classical Latin has no articles like English a, an, and the.

So:

• milites can mean soldiers or the soldiers
• campo can mean a field, the field, or just field depending on context

English must choose an article, but Latin usually leaves that idea to context.

Because mille is a numeral describing a countable noun, and milites is the noun that makes sense as something being counted.

So:

• mille milites = one thousand soldiers

It would not make sense here for mille to go with campo, since the sentence is not talking about one thousand fields.

Grammar and meaning work together here: milites is plural and is the obvious noun being counted.

Usually it means the literal number one thousand soldiers.

However, like large numbers in many languages, it can sometimes be used less precisely in rhetorical or poetic contexts. But in a straightforward beginner sentence like this one, you should understand it literally:

• mille = one thousand

So the normal reading is simply One thousand soldiers are standing in the field.