camp._

In each of these sentences we find a dative expressing the _purpose
or end for which_ something is intended or for which it serves. These
datives are /castris\, /impedimento\, and /praesidio\. In the second and
third sentences we find a second dative expressing the _person or thing
affected_ (Gallis and castris). As you notice, these are true
datives, covering the relations of _for which_ and _to which_. (Cf.
Sec. 43.)

_437._ RULE. Dative of Purpose or End. _The dative is used to denote
the /purpose or end for which\, often with another dative denoting the
/person or thing affected\._

_438._ IDIOMS

consilium omittere, _to give up a plan_
locum castris deligere, _to choose a place for a camp_
alicui magno usui esse, _to be of great advantage to some one_
(lit. _for great advantage to some one_)

_439._ EXERCISES

I. 1. Rogavit cur illae copiae relictae essent. Responderunt illas
copias esse praesidio castris. 2. Caesar misit exploratores ad locum
deligendum castris. 3. Quisque existimavit ipsum nomen Caesaris magno
terrori barbaris futurum esse. 4. Prima luce idem exercitus proelium
acre commisit, sed gravia suorum vulnera magnae curae imperatori erant.
5. Rex respondit amicitiam populi Romani sibi ornamento et praesidio
debere esse. 6. Quis praeerat equitatui quem auxilio Caesari socii
miserant? 7. Aliquibus res secundae sunt summae calamitati et res
adversae sunt miro usui. 8. Gallis magno ad pugnam erat impedimento quod
equitatus a dextro cornu premebat. 9. Memoria pristinae virtutis non
minus quam metus hostium erat nostris magno usui. 10. Tam densa erat
silva ut progredi non possent.

II. 1. I advise you [1]to give up the plan [2]of making war upon the
brave Gauls. 2. Do you know [3]where the cavalry has chosen a place for
a camp? 3. The fear of the enemy will be of great advantage to you.
4. Caesar left three cohorts as (for) a guard to the baggage. 5. In
winter the waves of the lake are so great [4]that they are (for) a great
hindrance to ships. 6. Caesar inflicted severe[5] punishment on those
who burned the public buildings.

[Footnote 1: Subjunctive of purpose. (Cf. Sec. 366.)]

[Footnote 2: Express by the genitive of the gerundive.]

[Footnote 3: Indirect question.]

[Footnote 4: A clause of result.]

[Footnote 5: /gravis, -e\.]

LESSON LXXVI

VOCABULARY REVIEW : THE GENITIVE AND ABLATIVE OF QUALITY OR DESCRIPTION

_440._ Review the word lists in