महाभारतः mahābhārataḥ - book-6, chapter-48, verse-15

पाञ्चालान्निहनिष्यन्ति रक्षिता दृढधन्वना ।
सोऽहं भीष्मं गमिष्यामि सैन्यहेतोर्जनार्दन ॥१५॥

15. pāñcālānnihaniṣyanti rakṣitā dṛḍhadhanvanā ,
so'haṁ bhīṣmaṁ gamiṣyāmi sainyahetorjanārdana.

15. pāñcālān nihaniṣyanti rakṣitāḥ dṛḍhadhanvanā
saḥ aham bhīṣmam gamiṣyāmi sainyahetoḥ janārdana

15. dṛḍhadhanvanā rakṣitāḥ pāñcālān nihaniṣyanti
janārdana saḥ aham sainyahetoḥ bhīṣmam gamiṣyāmi

15. Protected by the strong-bowman, they will destroy the Pāñcālas. Therefore, O Janārdana, I will go to Bhīṣma for the sake of the army.

Words meanings summery:

• पाञ्चालान् (pāñcālān) - the Panchalas (people of Panchala)

• निहनिष्यन्ति (nihaniṣyanti) - they will destroy, they will kill

• रक्षिताः (rakṣitāḥ) - protected, guarded

• दृढधन्वना (dṛḍhadhanvanā) - by Drona (the preceptor, known for his archery) (by the strong-bowman, by one having a firm bow)

• सः (saḥ) - so I (he, that)

• अहम् (aham) - I

• भीष्मम् (bhīṣmam) - to Bhishma

• गमिष्यामि (gamiṣyāmi) - I will go

• सैन्यहेतोः (sainyahetoḥ) - for the sake of the army, on account of the army

• जनार्दन (janārdana) - O Krishna (epithet of Krishna) (O Janardana)

Words meanings and morphology

पाञ्चालान् (pāñcālān) - the Panchalas (people of Panchala)

(proper noun)

Accusative, masculine, plural of pāñcāla

pāñcāla - Panchala (name of a country and its people)

निहनिष्यन्ति (nihaniṣyanti) - they will destroy, they will kill

(verb)

3rd person , plural, active, future (lṛṭ) of √han

Prefix: ni

Root: han (class 2)

रक्षिताः (rakṣitāḥ) - protected, guarded

(adjective)

Nominative, masculine, plural of rakṣita

rakṣita - protected, guarded, preserved

Past Passive Participle

Past passive participle of √rakṣ (to protect).

Root: rakṣ (class 1)

Note: Agrees with the implied subject (Droṇa, Kṛpa, etc.) from the previous verse.

दृढधन्वना (dṛḍhadhanvanā) - by Drona (the preceptor, known for his archery) (by the strong-bowman, by one having a firm bow)

(noun)

Instrumental, masculine, singular of dṛḍhadhanvan

dṛḍhadhanvan - having a strong bow, strong-bowman

Compound type : bahuvrīhi (dṛḍha+dhanvan)

• dṛḍha – firm, strong, rigid
  adjective (masculine)
• dhanvan – bow
  noun (neuter)

सः (saḥ) - so I (he, that)

(pronoun)

Nominative, masculine, singular of tad

tad - that, he, she, it

Note: Often used to emphasize a previous statement or implication, translating to 'so' or 'therefore'.

अहम् (aham) - I

(pronoun)

Nominative, singular of aham

aham - I

भीष्मम् (bhīṣmam) - to Bhishma

(proper noun)

Accusative, masculine, singular of bhīṣma

bhīṣma - Bhishma (name of a Kuru elder)

गमिष्यामि (gamiṣyāmi) - I will go

(verb)

1st person , singular, active, future (lṛṭ) of √gam

Root: gam (class 1)

सैन्यहेतोः (sainyahetoḥ) - for the sake of the army, on account of the army

(noun)

Genitive, masculine, singular of sainyahetu

sainyahetu - cause/reason for the army, sake of the army

Compound type : tatpuruṣa (sainya+hetu)

• sainya – belonging to an army, military; an army
  noun (neuter)
• hetu – cause, reason, motive, sake
  noun (masculine)

Note: Often used with the genitive or ablative to mean 'for the sake of'.

जनार्दन (janārdana) - O Krishna (epithet of Krishna) (O Janardana)

(proper noun)

Vocative, masculine, singular of janārdana

janārdana - agitator of men, punisher of men; an epithet of Vishnu/Krishna