The Malachim

וַיִּשְׁלַ֨ח יַעֲקֹ֤ב מַלְאָכִים֙ לְפָנָ֔יו.  The word לפניו seems extra, obviously the malachim went before him?  Why does Yaakov tell Lavan תריג מצות שמרתי?  The Lev Eliyahu says that לפניו means that Yaakov sent the malachim that went before him, those created by his own actions.  A person's mitzvot create malachim and it was those malachim that Yaakov sent.  That is the message of תריג מצות שמרתי, that the malachim were a product of the mitzvot.  Why does it matter what type of malachim Yaakov sent?  What Yaakov was trying to do was not merely to deflect Esev but to see if he could arouse from within him his genetic traits from the Avos.  By sending mitzva malachim, Yaakov was hoping that there would be a magnetic pull to Esev's innards and he would repent.  It was not a complete failure as Esev let him go peacefully in their encounter (see Shem M'Shmuel.)  

Why did Esev come with 400 men?  4 is the number of פירוד.  The number 400 is 4*100, the most extreme פירוד.  That is reflected is Esev's statement, יש לי רב.  He viewed his possessions as many things, they were separate items.  Yaakov sees everything as one yesod.  Everything in the world is a reflection of the ultimate יחוד and hence he says יש לי כל, it is one complete unit (see Or Hachaim and Sfas Emes.)  That is the message of the stones under Yaakov's head combining into one rock.  

A quick thought on 19 Kislev.  The gematria of אדם is 45.  The gematria of  the name of Hashem is 26.  The bridge is 19.  It is chasidic thought that describes in great detail the concept of yichud Hashem.  That is part of the celebration of 19 Kislev.