Cum tempestas navibus noceret, nautae aliis nautis succurrebant.

Here cum introduces a subordinate clause: Cum tempestas navibus noceret.

With the subjunctive (as here), cum often means something like when, since, or although, depending on context. In this sentence, it is most naturally understood as a circumstantial or temporal cum clause:

• when the storm was harming the ships
• or since the storm was harming the ships

A learner will often first meet cum as a preposition meaning with, but that is a different use. Here it is a conjunction, not a preposition.

Because after this kind of cum clause, Latin commonly uses the subjunctive.

So:

• noceret = imperfect subjunctive of nocere
• not indicative nocebat

This is a very common construction in Latin. A cum + subjunctive clause often gives the background or circumstances for the main action.

So the idea is not just a simple time marker like at the exact moment when, but more like:

• while / when the storm was harming the ships
• under those circumstances

It is imperfect because the action is ongoing in past time.

• tempestas navibus noceret = the storm was harming the ships
• nautae ... succurrebant = the sailors were helping ...

Both actions are happening in the past and are presented as continuing or repeated, not as single completed events.

The imperfect often gives a sense of:

• was doing
• kept doing
• used to do

So the storm was not harming the ships just once; it was an ongoing situation.

For the same general reason: it describes an action in progress in past time.

• succurrebant = they were helping or they kept helping

This matches the background situation set by noceret. The sentence paints a scene:

• the storm was harming the ships
• the sailors were helping other sailors

The imperfect is very common for this kind of descriptive, ongoing past action.

Because both verbs here take the dative of the person or thing affected:

• nocere alicui = to harm someone / something
• succurrere alicui = to help someone

So:

• navibus noceret = was harming the ships
• aliis nautis succurrebant = were helping other sailors

This can feel strange to English speakers, because English usually uses a direct object:

• harm the ships
• help the sailors

But Latin often uses the dative with these verbs instead.

Because succurrere does not take a direct object in the accusative. It takes the dative.

So:

• correct: aliis nautis succurrebant
• not: alios nautas succurrebant

Literally, Latin thinks of this more like they were coming to the aid of other sailors.

This is one of those verbs whose case pattern simply has to be learned with the verb:

• succurrere + dative

Because nautae could in theory be either:

• nominative plural = sailors
• or dative singular = to/for the sailor

But the verb succurrebant is 3rd person plural, so it needs a plural subject. Therefore nautae here must be nominative plural:

• nautae ... succurrebant = the sailors were helping

Meanwhile aliis nautis is clearly dative plural, which fits the verb succurrere.

So the verb ending helps you decide the case and function.

They are different forms of the same noun nauta, nautae:

• nautae = nominative plural, the subject
• nautis = dative or ablative plural; here it is dative plural, the people being helped

So the sentence means that the sailors were helping other sailors.

Latin often uses different case endings where English would rely mostly on word order.

Yes. Nauta is a first-declension masculine noun.

That may seem odd at first, because learners often associate:

• first declension = feminine

But some nouns referring to occupations or male persons are first declension and masculine, such as:

• nauta = sailor
• agricola = farmer
• poeta = poet

So in this sentence:

• nautae = sailors
• nautis = to/for sailors

Even though the forms look like first-declension feminine patterns, the noun is masculine in gender.

Latin word order is much more flexible than English word order because case endings show the grammatical relationships.

A very common Latin style is to place the verb near the end of the clause, especially in straightforward prose:

• Cum tempestas navibus noceret
• nautae aliis nautis succurrebant

That said, Latin does not have a fixed rule that the verb must come last. Authors move words around for emphasis, rhythm, and clarity. But verb-final order is very common and is something learners should get used to.

It could, in the right context, because cum + subjunctive can sometimes be concessive:

• although the storm was harming the ships

But without extra signals, the most natural reading here is probably when or since, because the sentence sounds like background circumstance rather than contrast.

If the author wanted to make the concessive idea clearer, Latin often adds something like tamen in the main clause:

• Cum ..., tamen ... = although ..., nevertheless ...

Since there is no tamen here, a temporal/circumstantial sense is more likely.

The verbs are:

• noceret from noceo, nocere, nocui = to harm
• succurrebant from succurro, succurrere, succurri (or succucurri) = to run to help, help, come to the aid of

It is worth memorizing them with their case pattern:

• nocere + dative
• succurrere + dative

That will help you understand sentences like this much more quickly.

Aliis means other and agrees with nautis.

Both are:

• dative plural
• masculine here

So:

• aliis nautis = to other sailors / other sailors

The adjective must match the noun it describes in case, number, and gender.

Not specifically. The Latin only says:

• nautae aliis nautis succurrebant = the sailors were helping other sailors

It does not explicitly say whether those other sailors were:

• on the same ship,
• on different ships,
• or in the water.

The sentence leaves that open. The meaning shown to the learner may make the situation clearer, but grammatically the Latin itself does not specify more than other sailors.

Because Latin verbs do not always match English patterns.

In English, we say:

• the storm harmed the ships

with ships as a direct object.

But Latin nocere is constructed differently:

• tempestas navibus noceret

Literally, you can think of it as something like:

• the storm was doing harm to the ships

That is why navibus is dative, not accusative.

This is an important habit in Latin: learn a verb together with the case it governs.