Perseus analyses of ἄμυνον:

ἄμῡνον,ἀμύνω (keep off, ward off): aor imperat act 2nd sg
ᾱμῡνον,ἀμύνω (keep off, ward off): imperf ind act 3rd pl (doric aeolic)
ᾱμῡνον,ἀμύνω (keep off, ward off): imperf ind act 1st sg (doric aeolic)
ἄμῡνον,ἀμύνω (keep off, ward off): imperf ind act 3rd pl (homeric ionic)
ἄμῡνον,ἀμύνω (keep off, ward off): imperf ind act 1st sg (homeric ionic)

LSJ entry

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ἀμύνω

ἀμύνω [ῡ], Ep. impf. ἄμῡνον Il. 15.731: fut. ἀμῠνῶ, Ion. -ῠνέω Hdt. 9.60, 3pl. -εῦσι ib.6: aor. 1 ἤμῡνα, Ep. ἄμυνα [ᾰμ] Il. 17.615: aor. 2, v. ἀμυνάθω:—Med., Ep. impf. ἀμυνόμην ib.13.514: fut. ἀμυνοῦμαι: aor. 1 ἠμυνάμην: aor. 2, v. ἀμυνάθω:—Pass. rare (v. infr. C):—

A. keep off, ward off, Hom., mostly in Il.—Construction:

1. c.acc. of the person or thing to be kept off, c. dat. pers. for or from whom danger averted, Δαναοῖσιν λοιγὸν ἄμυνον ward off ruin from the Danai, Il. 1.456, cf. 341, Od. 8.525 :—dat. freq. omitted, ὃς λοιγὸν ἀμύνει Il. 5.603; ἄ. τὸν βάρβαρον Pl. Lg. 692e, cf.AB 79.

2. c. acc. et gen., Τρῶας ἄμυνε νεῶν he kept the Trojans off from the ships, Il. 15.731, cf.4.11, 12.402.

b. c. gen. only, ἀ. νηῶν defend the ships, ib.13.109.

3. abs., succour, χεῖρες ἀμύνειν hands to aid, ib.814; ἀμύνειν εἰσὶ καὶ ἄλλοι ib.312; ὦ ξυνδικασταί . . ἀμύνατε help! Ar. V. 197; τὰ ἀμυνεῦντα means of defence, Hdt. 3.155: c. dat. modi, σθένει ἀ. defend with might, Il. 13.678.

II. less freq. like B. II, requite, repay, ἔργʼ ἀμύνουσιν κακά S. Ph. 602; ἀμύνειν . . τοῖσδε τοῖς λόγοις τάδε Id. OC 1128.

B. Med., keep or ward off from oneself, guard or defend oneself against, freq. with collat. notion of requital, revenge:

1. c. acc. rei, ἀμύνετο νηλεὲς ἦμαρ Il. 13.514; ἀμύνεσθαι μόρον A. Ag. 1381; τὸ δυστυχὲς γὰρ ηὑγένειʼ ἀμύνεται E. Heracl. 303, cf. S. Fr. 1004.

b. c.acc. pers., ἀ. τὴν Δαρείου στρατιήν Hdt. 3.158; ἐκεῖνον ἠμύναντο S. Fr. 589.

2. that from which danger is warded off in gen., as in Act. I.2, ἀμυνόμενοι σφῶν αὐτῶν Il. 12.155; νηῶν ἠμύνοντο ib.179.

3. with Preps., ἀμύνεσθαι περὶ πάτρης ib.243; περὶ τῶν οἰκείων Th. 2.39; ὑπέρ τινος X. Cyn. 9.9.

C. very rarely Pass., ἀμύνονται ἆται are warded off, Pi. P. 11.54; ἀμυνέσθω let him be driven away, Pl. Lg. 845c.